feat(bisaya-course): enhance German course content and localization support

- Updated the create-german-for-bisaya-course-content.js script to improve lesson pattern retrieval by introducing a new function for generating a lesson pattern pool.
- Added new exercises for various topics including 'Wohnung & Nachbarn', 'Besuch empfangen', 'Arzt, Apotheke, Termin', and 'Amt, Dokumente, Anmeldung', enhancing practical language skills for learners.
- Improved localization by integrating translation keys for various UI elements and error messages across multiple components, ensuring a consistent user experience in both German and Bisaya.
- Enhanced the main.js file to recognize Bisaya language preferences in browser settings, improving accessibility for users.

frontend/src/main.js

@@ -12,6 +12,10 @@ import feedbackPlugin from './utils/feedback';
 function getBrowserLanguage() {
     // Prüfe zuerst die bevorzugte Sprache
     const browserLanguage = navigator.language || navigator.languages[0];
+
+    if (browserLanguage.startsWith('ceb') || browserLanguage.startsWith('bis')) {
+        return 'ceb';
+    }
     
     // Deutschsprachige Länder: Deutschland, Österreich, Schweiz, Liechtenstein
     const germanSpeakingCountries = ['de', 'at', 'ch', 'li'];
@@ -24,6 +28,9 @@ function getBrowserLanguage() {
     // Prüfe alle verfügbaren Sprachen für deutschsprachige Länder
     const allLanguages = navigator.languages || [navigator.language];
     for (const lang of allLanguages) {
+        if (lang.startsWith('ceb') || lang.startsWith('bis')) {
+            return 'ceb';
+        }
         // Prüfe auf de-XX Format (z.B. de-DE, de-AT, de-CH, de-LI)
         if (lang.startsWith('de-')) {
             const countryCode = lang.split('-')[1]?.toLowerCase();