Resolve "[DOM] Found 2 elements with non-unique id #language-select"

There are two language forms on the page: One is shown on large devices, the other on small devices. So they can't use unique ids, and the auto-submit function must submit the correct form (and not just both). This also mades this very ugly lines of code superfluous.

Closes #418 (closed)

aleksis/core/static/js/main.js

@@ -63,12 +63,7 @@ $(document).ready(function () {
 
     // If JS is activated, the language form will be auto-submitted
     $('.language-field select').change(function () {
-
-        // Ugly bug fix to ensure correct value
-        const selectEl = $("select[name=language]");
-        selectEl.val(selectEl.val());
-
-        $(".language-form").submit();
+        $(this).parents(".language-form").submit();
     });
 
     // If auto-submit is activated (see above), the language submit must not be visible