feat(admin-center): implement organization calculation method settings

- Added functionality to update the organization's calculation method (hourly or man-days) in the Admin Center.
- Created a new component for managing the calculation method, including UI elements for selection and saving changes.
- Updated API service to handle the new endpoint for updating the calculation method.
- Enhanced localization files to support new keys related to the calculation method settings.
- Introduced a settings page to manage organization working days and hours alongside the calculation method.

worklenz-frontend/public/locales/de/admin-center/overview.json

@@ -4,5 +4,29 @@
   "owner": "Organisationsinhaber",
   "admins": "Organisationsadministratoren",
   "contactNumber": "Kontaktnummer hinzufügen",
-  "edit": "Bearbeiten"
+  "edit": "Bearbeiten",
+  "organizationWorkingDaysAndHours": "Arbeitstage und -stunden der Organisation",
+  "workingDays": "Arbeitstage",
+  "workingHours": "Arbeitsstunden",
+  "monday": "Montag",
+  "tuesday": "Dienstag",
+  "wednesday": "Mittwoch",
+  "thursday": "Donnerstag",
+  "friday": "Freitag",
+  "saturday": "Samstag",
+  "sunday": "Sonntag",
+  "hours": "Stunden",
+  "saveButton": "Speichern",
+  "saved": "Einstellungen erfolgreich gespeichert",
+  "errorSaving": "Fehler beim Speichern der Einstellungen",
+  "organizationCalculationMethod": "Organisations-Berechnungsmethode",
+  "calculationMethod": "Berechnungsmethode",
+  "hourlyRates": "Stundensätze",
+  "manDays": "Mann-Tage",
+  "saveChanges": "Änderungen speichern",
+  "hourlyCalculationDescription": "Alle Projektkosten werden anhand geschätzter Stunden × Stundensätze berechnet",
+  "manDaysCalculationDescription": "Alle Projektkosten werden anhand geschätzter Mann-Tage × Tagessätze berechnet",
+  "calculationMethodTooltip": "Diese Einstellung gilt für alle Projekte in Ihrer Organisation",
+  "calculationMethodUpdated": "Organisations-Berechnungsmethode erfolgreich aktualisiert",
+  "calculationMethodUpdateError": "Fehler beim Aktualisieren der Berechnungsmethode"
 }