feat(localization): update project view header translations and enhance UI functionality

- Added new translations for "Import task", "Refresh project", "Save as template", and "Invite" in Albanian, German, English, Spanish, and Portuguese.
- Refactored `ProjectViewHeader` component to optimize rendering with memoization and improved state management.
- Enhanced task creation and subscription handling with better performance and error management.
- Improved dropdown and button actions for a more intuitive user experience.

worklenz-frontend/public/locales/de/project-view/project-view-header.json

@@ -1,5 +1,6 @@
 {
   "importTasks": "Aufgaben importieren",
+  "importTask": "Aufgabe importieren",
   "createTask": "Aufgabe erstellen",
   "settings": "Einstellungen",
   "subscribe": "Abonnieren",
@@ -9,5 +10,8 @@
   "endDate": "Enddatum",
   "projectSettings": "Projekteinstellungen",
   "projectSummary": "Projektzusammenfassung",
-  "receiveProjectSummary": "Erhalten Sie jeden Abend eine Projektzusammenfassung."
+  "receiveProjectSummary": "Erhalten Sie jeden Abend eine Projektzusammenfassung.",
+  "refreshProject": "Projekt aktualisieren",
+  "saveAsTemplate": "Als Vorlage speichern",
+  "invite": "Einladen"
 }