Fixes #31: Do not strip umlauts in sanitize function

static/game/bootstrap/renderer.js

@@ -203,7 +203,7 @@ function submit(_button) {
     switch (element.getAttribute("type")) {
       case "text":
         inputs[element.getAttribute("name")] = element.value.replace(
-          /[^0-9a-zA-Z\s]/g,
+          /[^\u0020\u00BF-\u1FFF\u2C00-\uD7FF\w]/g,
           ""
         );
         break;