feat(TournamentStats): enhance internal tournament statistics with age class filtering

- Updated the `getInternalTournamentPlayerStats` endpoint to accept age class keys for more granular statistics.
- Introduced new utility functions for handling age class filtering in the internal tournament stats service.
- Enhanced the InternalTournamentStats component with a new age class filter UI, allowing users to select specific age classes for their statistics.
- Updated localization strings across multiple languages to support the new age class filtering feature, improving user accessibility and understanding.

backend/controllers/tournamentController.js

@@ -64,8 +64,9 @@ export const getInternalTournamentStats = async (req, res) => {
     const { authcode: token } = req.headers;
     const { clubId } = req.params;
     const months = req.query.months;
+    const ageClassKeys = req.query.ageClassKeys;
     try {
-        const data = await tournamentService.getInternalTournamentPlayerStats(token, clubId, months);
+        const data = await tournamentService.getInternalTournamentPlayerStats(token, clubId, months, ageClassKeys);
         res.status(200).json(data);
     } catch (error) {
         console.error(error);