feat(tournaments): add update functionality for official tournaments

- Implemented an API endpoint to update the title of official tournaments, including error handling for non-existent tournaments.
- Enhanced the frontend to allow users to edit tournament titles directly, with input validation and feedback for successful updates or errors.
- Updated the German localization file to include new strings for editing titles and error messages.

backend/controllers/officialTournamentController.js

@@ -1,6 +1,21 @@
 import { checkAccess } from '../utils/userUtils.js';
 import officialTournamentService from '../services/officialTournamentService.js';
 
+export const updateOfficialTournament = async (req, res) => {
+  try {
+    const { authcode: userToken } = req.headers;
+    const { clubId, id } = req.params;
+    await checkAccess(userToken, clubId);
+
+    const result = await officialTournamentService.updateOfficialTournament(clubId, id, req.body);
+    if (!result) return res.status(404).json({ error: 'not found' });
+    res.status(200).json(result);
+  } catch (e) {
+    console.error('[updateOfficialTournament] Error:', e);
+    res.status(500).json({ error: 'Failed to update tournament' });
+  }
+};
+
 export const uploadTournamentPdf = async (req, res) => {
   try {
     const { authcode: userToken } = req.headers;