feat(admin-center): implement admin center settings retrieval and enhance holiday population logic

- Added a new API endpoint in AdminCenterController to fetch admin center settings, including organization details.
- Updated the admin center API router to include the new settings route.
- Enhanced the holiday controller to check for recent holiday population before attempting to repopulate, preventing duplicate entries.
- Improved the holiday calendar component to manage holiday population attempts and display loading states.
- Updated localization files to support new messages related to calculation methods and holiday settings.

worklenz-backend/src/controllers/holiday-controller.ts

@@ -264,6 +264,27 @@ export default class HolidayController extends WorklenzControllerBase {
 
   @HandleExceptions()
   public static async populateCountryHolidays(req: IWorkLenzRequest, res: IWorkLenzResponse): Promise<IWorkLenzResponse> {
+    // Check if this organization has recently populated holidays (within last hour)
+    const recentPopulationCheck = `
+      SELECT COUNT(*) as count
+      FROM organization_holidays 
+      WHERE organization_id = (SELECT id FROM organizations WHERE user_id = $1)
+      AND created_at > NOW() - INTERVAL '1 hour'
+    `;
+    
+    const recentResult = await db.query(recentPopulationCheck, [req.user?.owner_id]);
+    const recentCount = parseInt(recentResult.rows[0]?.count || '0');
+    
+    // If there are recent holidays added, skip population
+    if (recentCount > 10) {
+      return res.status(200).send(new ServerResponse(true, {
+        success: true,
+        message: "Holidays were recently populated, skipping to avoid duplicates",
+        total_populated: 0,
+        recently_populated: true
+      }));
+    }
+
     const Holidays = require("date-holidays");
 
     const countries = [