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/components/SettingsWidget.vue

@@ -173,13 +173,14 @@ export default {
                 this.fetchSettings();
             } catch (err) {
                 console.error('Error updating setting:', err);
-                showApiError(this, err, 'Änderung konnte nicht gespeichert werden.');
+                showApiError(this, err, 'tr:settings.feedback.updateError');
             }
         },
         languagesList() {
             return [
-                { value: 'en', captionTr: 'settings.personal.languages.en' },
-                { value: 'de', captionTr: 'settings.personal.languages.de' },
+                { value: 'en', captionTr: 'settings.personal.language.en' },
+                { value: 'de', captionTr: 'settings.personal.language.de' },
+                { value: 'ceb', captionTr: 'settings.personal.language.ceb' },
             ];
         },
         convertToInt(value) {
@@ -207,7 +208,7 @@ export default {
                 });
             } catch (err) {
                 console.error('Error updating visibility:', err);
-                showApiError(this, err, 'Sichtbarkeit konnte nicht aktualisiert werden.');
+                showApiError(this, err, 'tr:settings.feedback.visibilityUpdateError');
             }
         },
         openContactDialog() {