fix(falukant): improve product pricing logic and update localization for office notifications

- Refactored the product pricing logic in `falukantService.js` to ensure accurate regional pricing calculations based on client values and server data.
- Added new notification translations for "office filled" in multiple languages (Cebuano, German, English, Spanish, French) to enhance user experience and clarity in notifications.

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

@@ -33,6 +33,7 @@
         },
         "notifications": {
             "notify_election_created": "A new election has been scheduled.",
+            "notify_office_filled": "A political office has been filled.",
             "director_death": "{characterName} died at the age of {ageYears}. As employer you need to appoint a new director.{regionLabel}{spouses}{children}{lovers}",
             "relationship_death": "{characterName} died at the age of {ageYears}.{regionLabel}{spouses}{children}{lovers}",
             "child_death": "Your child {characterName} died at the age of {ageYears}.{regionLabel}",