Refactor error handling in FalukantService and enhance user feedback in HealthView

- Changed error throwing in FalukantService to use PreconditionError for better clarity.
- Added translations for "too close" error in both German and English locales.
- Improved user feedback in HealthView by displaying error messages in a dialog upon measure execution failure.

backend/services/falukantService.js

@@ -4180,7 +4180,7 @@ class FalukantService extends BaseService {
             limit: 1
         });
         if (lastHealthActivity) {
-            throw new Error('too close');
+            throw new PreconditionError('tr:falukant.healthview.errors.tooClose');
         }
         const activityObject = FalukantService.HEALTH_ACTIVITIES.find((a) => a.tr === activity);
         if (!activityObject) {