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/es/falukant.json

@@ -658,6 +658,7 @@
             "lovers": {
                 "title": "Amantes y favoritas",
                 "none": "No hay amantes.",
+                "age": "Edad",
                 "affection": "Afecto",
                 "visibility": "Visibilidad",
                 "discretion": "Discreción",