diff --git a/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navbar_dropdown.html b/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navbar_dropdown.html
index 178db5559a3145434e4b3385f7956685be4680c9..cea019207ed9001ebf17265bae6c7d48d0ad7d07 100644
--- a/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navbar_dropdown.html
+++ b/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navbar_dropdown.html
@@ -4,6 +4,7 @@
                         Admin
                     </a>
                     <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                        <!-- TODO: change URL to for_url() -->
                         <a class="dropdown-item" href="/admin/tasks">Admin</a>
                         <div class="dropdown-divider"></div>
                         <a class="dropdown-item" href="/admin/tasks">admin tasks</a>
diff --git a/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navtabs.html b/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navtabs.html
index cffb2b066a1f11a997c1b593bd62ea4843696a84..43b16146cef6e851abd26a76685ac7dbb2ffec48 100644
--- a/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navtabs.html
+++ b/src/covid19/blueprints/admin/templates/admin/fragments/fragment_admin_navtabs.html
@@ -1,5 +1,6 @@
 
             <nav>
+                <!-- TODO: change URL to for_url() -->
                 <ul class="nav nav-tabs">
                     <li class="nav-item">
                         <a class="nav-link" href="/admin/info">admin Info</a>
diff --git a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_all.html b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_all.html
index 9253e824df5a768cc12557a855d735f480ec42e4..406ca1c869972ba6c9feb21f6017129fc7ac022d 100644
--- a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_all.html
+++ b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_all.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_germany.html b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_germany.html
index 9eb4e35a4d68000e798803968e2aa727955c5a10..b2db25d26536dc31d36e04b93c21cc42520d2ecd 100644
--- a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_germany.html
+++ b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_germany.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_one.html b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_one.html
index d944415b3b6176bf94e7ad4f57b0761db1cdd7fa..e5632c08c18c2f1e49b4b1c8c76a3ad2a07e6a06 100644
--- a/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_one.html
+++ b/src/covid19/blueprints/europe/templates/europe/continent/europe_continent_one.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/country/europe_country_all.html b/src/covid19/blueprints/europe/templates/europe/country/europe_country_all.html
index 23adee3f18c2274a0835af7478a1c9f6822cbb82..89e87cf9405bc490254e490fa9d4f6557da8bdc2 100644
--- a/src/covid19/blueprints/europe/templates/europe/country/europe_country_all.html
+++ b/src/covid19/blueprints/europe/templates/europe/country/europe_country_all.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/country/europe_country_germany.html b/src/covid19/blueprints/europe/templates/europe/country/europe_country_germany.html
index fb8b7bc2c7151159c093d6de4103fff58d945d68..d2b848bf3c353066e054b6bda7004f0490e0271e 100644
--- a/src/covid19/blueprints/europe/templates/europe/country/europe_country_germany.html
+++ b/src/covid19/blueprints/europe/templates/europe/country/europe_country_germany.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_navtabs %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
   {% include 'europe/fragments/fragment_europe_navtabs.html' %}
 {% endblock %}
 
diff --git a/src/covid19/blueprints/europe/templates/europe/country/europe_country_one.html b/src/covid19/blueprints/europe/templates/europe/country/europe_country_one.html
index e47d2a986e04be4fb0524f3d8bce3fd71cb702bf..7e33717e85f59af5eefb17b372b5bf1c2068d747 100644
--- a/src/covid19/blueprints/europe/templates/europe/country/europe_country_one.html
+++ b/src/covid19/blueprints/europe/templates/europe/country/europe_country_one.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_navtabs %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
   {% include 'europe/fragments/fragment_europe_navtabs.html' %}
 {% endblock %}
 
diff --git a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_all.html b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_all.html
index ea45fa67a0ebd5c636468b20be620c0b78bc5ac5..5ccca94262d11f73d6ce292c9a4ee2de891ecd8a 100644
--- a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_all.html
+++ b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_all.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one.html b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one.html
index b40f27e3adea6dd0e1b0b849de6d1aaacacbe578..255f43aec5e8f1429c86cd2d64ea509d20ed05f2 100644
--- a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one.html
+++ b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}
diff --git a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_cases_weekly.html b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_cases_weekly.html
index e51d5c51d057a1885a6317a28cff526be1398628..351ee3a14a723c8a1f3ffa10d32d7e7105f577a5 100644
--- a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_cases_weekly.html
+++ b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_cases_weekly.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}
diff --git a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_deaths_weekly.html b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_deaths_weekly.html
index 55dd0fdb0e912ec6ad4c51668c491ca6e3b01ef3..326dc849cf3dbd5eac04a8b3d54c3ffb440f908e 100644
--- a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_deaths_weekly.html
+++ b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_deaths_weekly.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}
diff --git a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_notification_rate.html b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_notification_rate.html
index 579a03fa52b8e56e5a9abc7cec57b209d3524d7b..46731348092cd7c7c2dacd704b14b925491e1745 100644
--- a/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_notification_rate.html
+++ b/src/covid19/blueprints/europe/templates/europe/date_reported/europe_date_reported_one_notification_rate.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}
diff --git a/src/covid19/blueprints/europe/templates/europe/europe_data.html b/src/covid19/blueprints/europe/templates/europe/europe_data.html
index c45e9391c3269e60dce5ed7c41b4bd66d24fcbbd..bde3d73cac59b99b5f64a6220b01c0ba586224c0 100644
--- a/src/covid19/blueprints/europe/templates/europe/europe_data.html
+++ b/src/covid19/blueprints/europe/templates/europe/europe_data.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/europe_imported.html b/src/covid19/blueprints/europe/templates/europe/europe_imported.html
index 4b0abaa1e27518813455872ac7427a1352078d94..9b1760f017b23279449595782c8d146cdc051046 100644
--- a/src/covid19/blueprints/europe/templates/europe/europe_imported.html
+++ b/src/covid19/blueprints/europe/templates/europe/europe_imported.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/europe_info.html b/src/covid19/blueprints/europe/templates/europe/europe_info.html
index 34445d4ae14a58722bb7c3f0e6747ddf284900e6..6fdc4243ac01d663c280617b56c066012c17dc25 100644
--- a/src/covid19/blueprints/europe/templates/europe/europe_info.html
+++ b/src/covid19/blueprints/europe/templates/europe/europe_info.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/europe_tasks.html b/src/covid19/blueprints/europe/templates/europe/europe_tasks.html
index 6393337b9b9f4bfa8cfe81b55d5704fe6ecbfceb..e9c3a21624641f72e0e92db5a4c30a4293db32a5 100644
--- a/src/covid19/blueprints/europe/templates/europe/europe_tasks.html
+++ b/src/covid19/blueprints/europe/templates/europe/europe_tasks.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navbar_dropdown.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navbar_dropdown.html
index 8853a9b391be784bbc0bb00613dcf5ea5fd4e4ff..e58db8700a613a77e6b1df5ee677b8f5d70e62e5 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navbar_dropdown.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navbar_dropdown.html
@@ -4,6 +4,7 @@
                         Europe
                     </a>
                     <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                        <!-- TODO: change URL to for_url() -->
                         <a class="dropdown-item" href="/europe/date_reported/all">Europe</a>
                         <div class="dropdown-divider"></div>
                         <a class="dropdown-item" href="/europe/country/germany">Europe Germany</a>
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navtabs.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navtabs.html
index 25be0356e95e557d76b848d11317f2197c0908b7..c1127d6a9603e83225e735582d078c8bdd4eb84a 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navtabs.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_navtabs.html
@@ -1,5 +1,6 @@
             <nav>
                 <ul class="nav nav-tabs">
+                    <!-- TODO: change URL to for_url() -->
                     <li class="nav-item">
                         <a class="nav-link" href="/europe/info">Europe Info</a>
                     </li>
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_continent.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_continent.html
index 5e0775eacdf56fde87652015a1fed02d6f80849f..2d3f3ff855fa25da04ab7d05d7dba81730ad47ae 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_continent.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_continent.html
@@ -8,6 +8,7 @@
         {% for europe_continent in page_data.items %}
             <tr>
                 <td>
+                    <!-- TODO: change URL to for_url() -->
                     <a href="/europe/continent/{{ europe_continent.id }}">
                         {{ europe_continent.continent_exp }}
                     </a>
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_country.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_country.html
index 8fdd45cfad8d6d85ac7030bef143ecb1e300e6e9..dea70ea6728218aca2f6150d5147920a7a4583a2 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_country.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_country.html
@@ -12,6 +12,7 @@
         <tbody>
         {% for europe_country in page_data.items %}
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <td>
                     <a href="/europe/country/{{ europe_country.id }}">
                         {{ europe_country.countries_and_territories }}
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_data.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_data.html
index 787453aaabd248f9c26ea43438b248cf33376487..fe3f9e44fb3c16e030da803ac08d4d0a115f4dbc 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_data.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_data.html
@@ -1,6 +1,7 @@
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <th scope="col">
                     <a href="/europe/date_reported/all">date rep</a>
                 </th>
diff --git a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_date_reported.html b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_date_reported.html
index 365eeb383032d0fc4b5fe96e6c33719c2e47cf30..7ea7cb14cced7c053456e38f736a1842bad21f6e 100644
--- a/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_date_reported.html
+++ b/src/covid19/blueprints/europe/templates/europe/fragments/fragment_europe_table_date_reported.html
@@ -1,30 +1,3 @@
-    <!--
-    <table class="table table-hover table-striped table-dark">
-        <thead class="table-secondary">
-            <tr>
-                <th scope="col">date reported</th>
-                <th scope="col">year week</th>
-            </tr>
-        </thead>
-        <tbody>
-        {% for europe_date_reported in page_data.items %}
-            <tr>
-                <td>
-                    <a href="/europe/date_reported/{{ europe_date_reported.id }}">
-                        {{ europe_date_reported.get_name_for_datum()  }}
-                    </a>
-                </td>
-                <td>
-                    <a href="/europe/date_reported/{{ europe_date_reported.id }}">
-                        {{ europe_date_reported.year_week }}
-                    </a>
-                </td>
-            </tr>
-        {% endfor %}
-        </tbody>
-    </table>
-    -->
-
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
@@ -37,6 +10,7 @@
         <tbody>
         {% for europe_date_reported in page_data.items %}
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <td class="text-right">
                     {{ europe_date_reported.get_name_for_weekday() }}
                 </td>
diff --git a/src/covid19/blueprints/rki/templates/rki/fragment_rki_navbar_dropdown.html b/src/covid19/blueprints/rki/templates/rki/fragment_rki_navbar_dropdown.html
index 92def6ee8f7878223f59d1e1aae693c65a04d955..76e81f79e95c5a067486b965ef89c1308afd3cab 100644
--- a/src/covid19/blueprints/rki/templates/rki/fragment_rki_navbar_dropdown.html
+++ b/src/covid19/blueprints/rki/templates/rki/fragment_rki_navbar_dropdown.html
@@ -4,6 +4,7 @@
                         RKI
                     </a>
                     <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                        <!-- TODO: change URL to for_url() -->
                         <a class="dropdown-item" href="/rki/info">RKI</a>
                         <div class="dropdown-divider"></div>
                         <a class="dropdown-item" href="/rki/imported">RKI imported</a>
diff --git a/src/covid19/blueprints/rki/templates/rki/fragment_rki_navtabs.html b/src/covid19/blueprints/rki/templates/rki/fragment_rki_navtabs.html
index b5fb42386170c0c88a7b06fd07d18d33feafccf9..3d5622caafc2a3c84e1b4125dcd4d56ce1104fc7 100644
--- a/src/covid19/blueprints/rki/templates/rki/fragment_rki_navtabs.html
+++ b/src/covid19/blueprints/rki/templates/rki/fragment_rki_navtabs.html
@@ -1,6 +1,7 @@
             <nav>
                 <ul class="nav nav-tabs">
                     <li class="nav-item">
+                        <!-- TODO: change URL to for_url() -->
                         <a class="nav-link" href="/rki/info">RKI Info</a>
                     </li>
                     <li class="nav-item">
diff --git a/src/covid19/blueprints/rki/templates/rki/rki_bundeslaender_imported.html b/src/covid19/blueprints/rki/templates/rki/rki_bundeslaender_imported.html
index 2a8897a1c4bc8588a48998b8e4b8422f2e33704d..e5e18a82f95f4b1cf1d16ec2570047d97402b18d 100644
--- a/src/covid19/blueprints/rki/templates/rki/rki_bundeslaender_imported.html
+++ b/src/covid19/blueprints/rki/templates/rki/rki_bundeslaender_imported.html
@@ -3,6 +3,7 @@
 {% include 'common/fragment_pagination.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/rki/templates/rki/rki_info.html b/src/covid19/blueprints/rki/templates/rki/rki_info.html
index 1706588e4027ba906f5af18c191d573d3886a48c..26c4d85c95511b73a064d41002497b847b2ba5ff 100644
--- a/src/covid19/blueprints/rki/templates/rki/rki_info.html
+++ b/src/covid19/blueprints/rki/templates/rki/rki_info.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/rki/templates/rki/rki_landkreise_imported.html b/src/covid19/blueprints/rki/templates/rki/rki_landkreise_imported.html
index 2a8897a1c4bc8588a48998b8e4b8422f2e33704d..e5e18a82f95f4b1cf1d16ec2570047d97402b18d 100644
--- a/src/covid19/blueprints/rki/templates/rki/rki_landkreise_imported.html
+++ b/src/covid19/blueprints/rki/templates/rki/rki_landkreise_imported.html
@@ -3,6 +3,7 @@
 {% include 'common/fragment_pagination.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/rki/templates/rki/rki_tasks.html b/src/covid19/blueprints/rki/templates/rki/rki_tasks.html
index 53171312f8e980abda54f60412fb4fbb72bc2c7d..f12154d21fb31399bf4ac881c979d39c25d8eb77 100644
--- a/src/covid19/blueprints/rki/templates/rki/rki_tasks.html
+++ b/src/covid19/blueprints/rki/templates/rki/rki_tasks.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navbar_dropdown.html b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navbar_dropdown.html
index 37db8a53b162ea7c2185cea3d8df2085565435a6..763da3022161b81bbf8aeb933ac7726761b71353 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navbar_dropdown.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navbar_dropdown.html
@@ -4,6 +4,7 @@
                         Vaccination
                     </a>
                     <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                         <!-- TODO: change URL to for_url() -->
                         <a class="dropdown-item" href="/vaccination/timeline/germany">Vaccination</a>
                         <div class="dropdown-divider"></div>
                         <a class="dropdown-item" href="/vaccination/tasks">Vaccination tasks</a>
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navtabs.html b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navtabs.html
index 212a6c912cdccb6fb3448c6ce1a0177e3b8ed622..48071d2460df7e395ab2601bd9d5433ee346df1c 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navtabs.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_navtabs.html
@@ -1,5 +1,6 @@
             <nav>
                 <ul class="nav nav-tabs">
+                <!-- TODO: change URL to for_url() -->
                     <li class="nav-item">
                         <a class="nav-link" href="/vaccination/info">Vaccination Info</a>
                     </li>
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_timeline_germany_table.html b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_timeline_germany_table.html
index 783ab5e0c1858bab8e721c0fe327aa0b55bf05c1..4354b426cd750baaa6540108a99fd4b07f36d157 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_timeline_germany_table.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/fragments/fragment_vaccination_timeline_germany_table.html
@@ -7,6 +7,7 @@
         <tbody>
         {% for vaccination_germany_timeline in page_data.items %}
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <td class="text-center table-dark" nowrap>{{ vaccination_germany_timeline.datum }}</td>
 
                 <td class="text-right table-secondary">{{ vaccination_germany_timeline.dosen_differenz_zum_vortag }}</td>
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_data.html b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_data.html
index 8d827f8b471e66397b7d23ce6e954d675d149d8c..562878c21052a921934f3117750a652e71aa6925 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_data.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_data.html
@@ -3,7 +3,7 @@
 {% include 'common/fragment_pagination.html' %}
 
 {% block navigation_breadcrumb %}
-
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_import.html b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_import.html
index 8d827f8b471e66397b7d23ce6e954d675d149d8c..562878c21052a921934f3117750a652e71aa6925 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_import.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_import.html
@@ -3,7 +3,7 @@
 {% include 'common/fragment_pagination.html' %}
 
 {% block navigation_breadcrumb %}
-
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_info.html b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_info.html
index a2dc028bc530fb0988ca84e41dfe12252d968803..35e7477845b0424c64c25d45896f8d1621b94106 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_info.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_info.html
@@ -1,7 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
-
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 
diff --git a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_tasks.html b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_tasks.html
index 7dd70e8b8498075775b691d6e6b86a335cd49607..adfcec5f8580fe939cbbf5223ef54459f4265592 100644
--- a/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_tasks.html
+++ b/src/covid19/blueprints/vaccination/templates/vaccination/vaccination_tasks.html
@@ -1,7 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
-
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_all.html b/src/covid19/blueprints/who/templates/who/country/who_country_all.html
index 3849a1d4b9f813544ad5dbba03815f5fbde29448..c60456d605c2a6ee19d4dafb6e5fb8bd57e4c24c 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_all.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_all.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_germany.html b/src/covid19/blueprints/who/templates/who/country/who_country_germany.html
index cd78b05d6ab5c7f468b3ef17847f57be88da5240..5cc8c5ec0adcb8834f8de715b9cf25e6c5b4fff9 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_germany.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_germany.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item">
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_one.html b/src/covid19/blueprints/who/templates/who/country/who_country_one.html
index ebd1f959b35d7477aedf1ab52fabb32244d844be..ee8058dd375a9bad963a3f77d1b588815cafc810 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_one.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_one.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_cumulative.html b/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_cumulative.html
index 38a0e74aba351580949d2965336f52079cff9be0..dbe7156f69cc549322c04598af79f47b58657edd 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_cumulative.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_cumulative.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_new.html b/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_new.html
index 36814ce8ac0b30637b481a99dbba83e5e7259e13..bf49f754c3a205acd1c2cbd2c86911bc2e1a83c0 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_new.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_one_cases_new.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_cumulative.html b/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_cumulative.html
index 12b462c54514a21558ae9bb8d061dc52149a8214..6283d8ac4583a10e44f1c931a5a035aaf828de68 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_cumulative.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_cumulative.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_new.html b/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_new.html
index 3f9665518c278dc8aa76eb6bc3a36e9f5e393547..7ef4f745ff294839b66651959cbb2f4a7c2265d1 100644
--- a/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_new.html
+++ b/src/covid19/blueprints/who/templates/who/country/who_country_one_deaths_new.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_all.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_all.html
index 41b1c1f86995a6572a5e3e95e9e670858e9beb69..0989b2c5da0a54265a32c8d6edc90ec0915984e8 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_all.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_all.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one.html
index cbd813b7a2f5e9673176a6740406c7631fd4e011..207ef195bf4a3b003fa55266eb159fabf7dea764 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_cumulative.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_cumulative.html
index ddafe9c1ef9ed3e0e9cb26cedb3282b46c4542d8..cf2a69eeed89f10afe46b3f57dc50c934a226a13 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_cumulative.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_cumulative.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_new.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_new.html
index 9b24dd54edf40e2c7150bc715b786c7ace44fcfd..86a571940cbd3c0ae4fea92d5541db65ca0be480 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_new.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_cases_new.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_cumulative.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_cumulative.html
index ddafe9c1ef9ed3e0e9cb26cedb3282b46c4542d8..cf2a69eeed89f10afe46b3f57dc50c934a226a13 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_cumulative.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_cumulative.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_new.html b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_new.html
index b6f98b24c58c8fef759de78c71e1b6248a918e2d..51794ed721cae8e287e86f3c57bf1ebfbfa78f44 100644
--- a/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_new.html
+++ b/src/covid19/blueprints/who/templates/who/date_reported/who_date_reported_one_deaths_new.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navbar_dropdown.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navbar_dropdown.html
index b97027af49d869511177e933c7feb03ee4262348..dcf7272520404a435f10d962df45a9b893aac965 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navbar_dropdown.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navbar_dropdown.html
@@ -4,6 +4,7 @@
                         WHO
                     </a>
                     <div class="dropdown-menu" aria-labelledby="navbarDropdown">
+                    <!-- TODO: change URL to for_url() -->
                         <a class="dropdown-item" href="/who/date_reported/all">WHO</a>
                         <div class="dropdown-divider"></div>
                         <a class="dropdown-item" href="/who/germany">WHO Germany</a>
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navtabs.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navtabs.html
index 1531100c6e46347c8f80359989e7ce24fe5345b9..ed73deb812539806f1db0c5a41aceb342217ee9a 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navtabs.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_navtabs.html
@@ -1,6 +1,7 @@
             <br/>
             <nav>
                 <ul class="nav nav-tabs">
+                    <!-- TODO: change URL to for_url() -->
                     <li class="nav-item">
                         <a class="nav-link"
                            href="/who/info">WHO Info</a>
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data.html
index 92a7fcb403864c27ff99058e2f155e7e0ad1f301..46f903b96366439ae3430cb31fc73575b9991df3 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data.html
@@ -1,6 +1,7 @@
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <th scope="col">
                     <a href="/who/date_reported/all">
                         date reported
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_country.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_country.html
index 71bb1e75b7f01afe3eb2ef59aa4e8517e5460554..2d2cca82e2fe936ea33688ea1e2366be2996c3ff 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_country.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_country.html
@@ -1,6 +1,7 @@
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <th scope="col">
                     <a href="/who/date_reported/all">
                         date reported
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_date_reported.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_date_reported.html
index a7c547dcc6f89253037e9749cfacdc25b4da72ed..2ae6a13ea410513317fe7ddfb5bfb327e48d633c 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_date_reported.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_global_data_date_reported.html
@@ -1,6 +1,7 @@
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <th scope="col">
                     <a href="/who/date_reported/all">
                         date reported
diff --git a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_who_country.html b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_who_country.html
index f6dc37e1040eff22b0c11da116d2715e8f30b5bf..b6b96d3531748e5045863ee33fbee2ddeff70d92 100644
--- a/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_who_country.html
+++ b/src/covid19/blueprints/who/templates/who/fragments/fragment_who_table_who_country.html
@@ -1,6 +1,7 @@
     <table class="table table-hover table-striped table-dark">
         <thead class="table-secondary">
             <tr>
+                <!-- TODO: change URL to for_url() -->
                 <th scope="col">
                     country
                 </th>
diff --git a/src/covid19/blueprints/who/templates/who/region/who_region_all.html b/src/covid19/blueprints/who/templates/who/region/who_region_all.html
index a0ae1cf9bb7a117311ccb6331b99f1624612b698..dd9e833136d022021d3e4c4afdcf0f9bec900a34 100644
--- a/src/covid19/blueprints/who/templates/who/region/who_region_all.html
+++ b/src/covid19/blueprints/who/templates/who/region/who_region_all.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/region/who_region_one.html b/src/covid19/blueprints/who/templates/who/region/who_region_one.html
index 3169d6aa4d92c3492f1e9f8848018addfe0aed89..2ef5651f6a7de5c894fc4b14e8c224f1609678ad 100644
--- a/src/covid19/blueprints/who/templates/who/region/who_region_one.html
+++ b/src/covid19/blueprints/who/templates/who/region/who_region_one.html
@@ -3,6 +3,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
     <nav aria-label="breadcrumb">
         <ol class="breadcrumb">
             <li class="breadcrumb-item"><a href="/">Home</a></li>
diff --git a/src/covid19/blueprints/who/templates/who/who_imported.html b/src/covid19/blueprints/who/templates/who/who_imported.html
index 1ae7534299f897df35d607d613e561b2d9b04266..50aba86497708a0638ef7f4d57aa53b70f59f14e 100644
--- a/src/covid19/blueprints/who/templates/who/who_imported.html
+++ b/src/covid19/blueprints/who/templates/who/who_imported.html
@@ -5,6 +5,7 @@
 {% block navigation_jumbotron %}{% endblock %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/who/templates/who/who_info.html b/src/covid19/blueprints/who/templates/who/who_info.html
index 85470ad804c56c4ba9a498a29a067dd1f5f6b76b..bd61bc3f2a928c977831516e32593e790f495e93 100644
--- a/src/covid19/blueprints/who/templates/who/who_info.html
+++ b/src/covid19/blueprints/who/templates/who/who_info.html
@@ -1,6 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 
 {% endblock %}
 
diff --git a/src/covid19/blueprints/who/templates/who/who_tasks.html b/src/covid19/blueprints/who/templates/who/who_tasks.html
index 0e4de8d5f55559535816e5089d3f81ad1ee45249..b2e1e642024bbe302281b237edd2573185410404 100644
--- a/src/covid19/blueprints/who/templates/who/who_tasks.html
+++ b/src/covid19/blueprints/who/templates/who/who_tasks.html
@@ -1,7 +1,7 @@
 {% extends 'common/page_layout.html' %}
 
 {% block navigation_breadcrumb %}
-
+    <!-- TODO: implement navigation_breadcrumb in .html -->
 {% endblock %}
 
 {% block navigation_navtabs %}