feat(task-management): enhance bulk action bar and localization updates

- Added new features to the OptimizedBulkActionBar, including dropdowns for labels and assignees, improving task management capabilities.
- Integrated task template creation functionality for owners/admins, allowing users to create templates from selected tasks.
- Updated localization files for multiple languages, adding new strings for label searching and template name requirements to enhance user experience.
- Refactored LabelsDropdown component to support label filtering and improved UI feedback for label creation.

worklenz-frontend/public/locales/de/tasks/task-table-bulk-actions.json

@@ -17,7 +17,9 @@
   "createTaskTemplate": "Aufgabenvorlage erstellen",
   "apply": "Anwenden",
   "createLabel": "+ Label erstellen",
+  "searchOrCreateLabel": "Label suchen oder erstellen...",
   "hitEnterToCreate": "Enter drücken zum Erstellen",
+  "labelExists": "Label existiert bereits",
   "pendingInvitation": "Einladung ausstehend",
   "noMatchingLabels": "Keine passenden Labels",
   "noLabels": "Keine Labels",