feat(user): add certificate production tracking and update localization

- Introduced a new field `certificateProductionsCountSince` in the `FalukantUser` model to track the date from which production logs are counted for certificate requirements.
- Updated the `FalukantService` to utilize the new field for calculating completed productions since the specified date.
- Enhanced the UI to display the count of productions since the last promotion, with corresponding translations added for multiple languages including Cebuano, German, English, Spanish, and French.
- Implemented a method to delete old production logs, ensuring efficient data management while maintaining necessary historical records for certificate calculations.

frontend/src/i18n/locales/de/falukant.json

@@ -178,6 +178,7 @@
                 },
                 "factors": "Aktuelle Werte",
                 "requirements": "Bedingungen für die nächste Stufe",
+                "productionsSince": "Nur Produktionen ab {date} zählen (seit letztem Aufstieg, Bankrott oder Erbfolge).",
                 "factor": {
                     "avgKnowledge": "Durchschnittliches Wissen",
                     "completedProductions": "Abgeschlossene Produktionen",