Use URLSearchParams for more robust lang selection

da/index.html

@@ -31,7 +31,7 @@ vil være mistænkte for børnemisbrug.
 
 
 <div id="app-area">
-<object id="movie" data="../img/chatapp.svg" type="image/svg+xml"></object>
+<object id="movie" data="../img/chatapp.svg?lang=da" type="image/svg+xml"></object>
 <p id="movie-sidetext">
 Lær mere om ChatControllen og hvorfor det er en dårlig idé, i vores interaktive ChatControl film ude til venstre.
 </p>

en/index.html

@@ -32,7 +32,7 @@ will be treated as suspects for child abuse.
 </p>
 
 <div id="app-area">
-<object id="movie" data="../img/chatapp.svg" type="image/svg+xml"></object>
+<object id="movie" data="../img/chatapp.svg?lang=en" type="image/svg+xml"></object>
 <p id="movie-sidetext">
 Learn more about Chat Control and why it is a bad idea by watching our
 interactive film on the left.

img/chatapp.svg

@@ -69,12 +69,7 @@ const typing_speed = 50;
 var conversation_count = 0;
 var current_dialog = null;
 
-var current_language = "da";
-if(location.protocol.startsWith('http')) { // avoid X-origin errors
-  if(parent.location.href.match(/\ben\b/)) {
-    current_language = 'en';
-  }
-} // else: Just stick to danish
+var current_language = new URLSearchParams(location.search).get('lang') ?? 'da';
 
 var current_dialog_fn = null;