feat(falukant): add age information to lovers in family view

- Updated FalukantService to include age details for partners in relationships.
- Added translations for 'age' in English, German, and Spanish localization files.
- Enhanced FamilyView component to display age information for lovers and candidates, improving user experience.

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

@@ -677,6 +677,7 @@
             "lovers": {
                 "title": "Liebhaber und Mätressen",
                 "none": "Keine Liebhaber vorhanden.",
+                "age": "Alter",
                 "affection": "Zuneigung",
                 "visibility": "Sichtbarkeit",
                 "discretion": "Diskretion",