Refactoring: convert language input element into svelte,remove many obsolete classes

src/UI/Test.svelte

@@ -1,7 +1,16 @@
 <script lang="ts">
   // Testing grounds
+  import LanguageElement from "./Popup/LanguageElement/LanguageElement.svelte"
+  import { UIEventSource } from "../Logic/UIEventSource"
 
-import Icon from "./Map/Icon.svelte"
+  let tags = new UIEventSource({_country: "Be"})
 </script>
 
-<Icon clss="h-16 w-16" icon="heart" color="#ff0000"/>
+
+<LanguageElement
+  feature={undefined}
+  item_render={"{language()} is spoken here"}
+  key="language"
+  layer={undefined}
+  question="What languages are spoken here?"
+  render_all={"Following languages are spoken here: {list()}"} single_render={"Only {language()} is spoken here"} state={undefined} {tags} />