feat(manage-courses): increase semester filter tabs from 3 to 6 and add missing translation

- Increase maxOtherPrograms from 3 to 6 to show last 6 semesters
- Add 'all_programs' translation key in German (Alle) and English (All)
- Update 'All' tab to use translation instead of hardcoded string
- Add translation dependency to useMemo for proper reactivity

Author: steffen74

frontend-nx/apps/edu-hub/components/pages/ManageCoursesContent/index.tsx

@@ -86,9 +86,9 @@ const ManageCoursesContent: FC<IProps> = ({ programs }) => {
 
   // Menubar configuration
   const allTabId = -1;
-  const maxOtherPrograms = 3;
+  const maxOtherPrograms = 6;
 
-  // Create programs list for menubar: EVENTS + DEGREES + 3 most recent others + All
+  // Create programs list for menubar: EVENTS + DEGREES + 6 most recent others + All
   const menubarPrograms: Programs_Program[] = useMemo(() => {
     const programs: Programs_Program[] = [];
 
@@ -109,13 +109,13 @@ const ManageCoursesContent: FC<IProps> = ({ programs }) => {
     // Add "All" option as a pseudo-program
     programs.push({
       id: allTabId,
-      shortTitle: 'All',
-      title: 'All',
+      shortTitle: t('all_programs'),
+      title: t('all_programs'),
       __typename: 'Program',
     } as Programs_Program);
 
     return programs;
-  }, [sortedPrograms, allTabId, maxOtherPrograms]);
+  }, [sortedPrograms, allTabId, maxOtherPrograms, t]);
 
   // Derive current program ID from filter (single source of truth)
   const currentProgramId = filter.where?.programId?._eq ?? allTabId;

frontend-nx/apps/edu-hub/locales/de/manageCourses.json

@@ -14,6 +14,7 @@
   "not_published": "Nicht veröffentlicht",
   "default_course_title": "Unbenannter Kurs",
   "title": "Kurse verwalten",
+  "all_programs": "Alle",
   "tile_slider_group": {
     "label": "Kachel-Slider Gruppe",
     "placeholder": "Kachel-Slider Gruppen auswählen"

frontend-nx/apps/edu-hub/locales/en/manageCourses.json

@@ -14,6 +14,7 @@
   "not_published": "Not Published",
   "default_course_title": "Untitled Course",
   "title": "Manage Courses",
+  "all_programs": "All",
   "tile_slider_group": {
     "label": "Tile Slider Group",
     "placeholder": "Select tile slider groups"