Add i18 support

frontend/src/stores/tenant.store.ts

@@ -40,9 +40,11 @@ export const useTenantStore = create<TenantState>()(
       setCurrentTenant: (tenant: TenantResponse) => {
         set({ currentTenant: tenant, currentTenantAccess: null });
         // Update API client with new tenant ID
-        tenantService.setCurrentTenant(tenant);
-        // Load tenant access info
-        get().loadCurrentTenantAccess();
+        if (tenant) {
+          tenantService.setCurrentTenant(tenant);
+          // Load tenant access info
+          get().loadCurrentTenantAccess();
+        }
       },
 
       switchTenant: async (tenantId: string): Promise<boolean> => {

frontend/src/stores/ui.store.ts

@@ -2,7 +2,7 @@ import { create } from 'zustand';
 import { persist, createJSONStorage } from 'zustand/middleware';
 
 export type Theme = 'light' | 'dark' | 'auto';
-export type Language = 'es' | 'en' | 'fr' | 'pt' | 'it';
+export type Language = 'es' | 'en' | 'eu';
 export type ViewMode = 'list' | 'grid' | 'card';
 export type SidebarState = 'expanded' | 'collapsed' | 'hidden';
 
@@ -152,7 +152,12 @@ export const useUIStore = create<UIState>()(
 
       setLanguage: (language: Language) => {
         set({ language });
-        // You might want to trigger i18n language change here
+        // Trigger i18n language change only if different
+        import('../i18n').then(({ default: i18n }) => {
+          if (i18n.language !== language) {
+            i18n.changeLanguage(language);
+          }
+        });
       },
 
       setSidebarState: (sidebarState: SidebarState) => {