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/en/project-view/project-view-header.json

@@ -1,5 +1,6 @@
 {
     "importTasks": "Import tasks",
+    "importTask": "Import task",
     "createTask": "Create task",
     "settings": "Settings",
     "subscribe": "Subscribe",
@@ -9,5 +10,8 @@
     "endDate": "End date",
     "projectSettings": "Project settings",
     "projectSummary": "Project summary",
-    "receiveProjectSummary": "Receive a project summary every evening."
+    "receiveProjectSummary": "Receive a project summary every evening.",
+    "refreshProject": "Refresh project",
+    "saveAsTemplate": "Save as template",
+    "invite": "Invite"
 }