Add income update success message in DirectorInfo component

- Implemented a success message display for income updates in the DirectorInfo component, enhancing user feedback after successful updates.
- Added a timeout to automatically hide the success message after 3 seconds.
- Updated localization files to include new translations for income-related messages in both German and English, improving user experience for multilingual users.

frontend/src/components/falukant/DirectorInfo.vue

@@ -68,6 +68,9 @@
             ({{ $t('falukant.director.wishedIncome') }}:
             {{ director.wishedIncome }})
           </span>
+          <div v-if="incomeUpdateSuccess" class="income-update-success">
+            {{ $t('falukant.branch.director.incomeUpdated') }}
+          </div>
         </div>
 
         <div class="field">
@@ -192,6 +195,7 @@ export default {
       director: null,
       showNewDirectorDialog: false,
       editIncome: null,
+      incomeUpdateSuccess: false,
       emptyTransportForm: {
         vehicleTypeId: null,
         targetBranchId: null,
@@ -264,6 +268,12 @@ export default {
           income: this.editIncome,
         });
         await this.loadDirector();
+        // Erfolgsnachricht anzeigen
+        this.incomeUpdateSuccess = true;
+        // Nach 3 Sekunden automatisch ausblenden
+        setTimeout(() => {
+          this.incomeUpdateSuccess = false;
+        }, 3000);
       } catch (error) {
         console.error('Error updating director:', error);
       }
@@ -462,6 +472,16 @@ export default {
   gap: 0.5rem;
 }
 
+.income-update-success {
+  margin-top: 0.5rem;
+  padding: 0.5rem;
+  background-color: #d4edda;
+  color: #155724;
+  border: 1px solid #c3e6cb;
+  border-radius: 4px;
+  font-size: 0.9em;
+}
+
 .toggles label {
   display: block;
 }