Don't throw an error when missing a translation - just log

If an error is thrown the whole program breaks. This combined with the
fact that several keys are missing across different translations makes
it a fairly inconvenient issue.

With this in place the program will finish with logs warning about the
missing keys.

Author: Esben Anker-Møller

HTMLCS.js

@@ -84,13 +84,15 @@ _global.HTMLCS = new function()
         var translations = _global.translation[this.lang];
 
         if (!translations) {
-            throw new Error ('Missing translations for language ' + this.lang);
+            console.error('Missing translations for language ' + this.lang);
+            return '';
         }
 
         var translation = translations[text];
 
         if (!translation) {
-            throw new Error('Translation for "' + text + '" does not exist in current language ' + this.lang);
+            console.error('Translation for "' + text + '" does not exist in current language ' + this.lang);
+            return '';
         }
 
         return translation;