Implement multi-language support in user management and system management pages

- Integrated multi-language functionality across various user management components, including user list, roles list, and user authorization pages, enhancing accessibility for diverse users.
- Updated UI elements to utilize translation keys, ensuring that all text is dynamically translated based on user preferences.
- Improved error handling messages to be localized, providing a better user experience in case of issues.

These changes significantly enhance the usability and internationalization of the user management features, making the application more inclusive.

frontend/components/admin/CompanyToolbar.tsx

@@ -9,24 +9,33 @@ interface CompanyToolbarProps {
   onSearchChange: (filter: Partial<CompanySearchFilter>) => void;
   onSearchClear: () => void;
   onCreateClick: () => void;
+  t?: (key: string, params?: Record<string, string | number>) => string;
 }
 
 /**
  * 회사 관리 툴바 컴포넌트
  * 검색, 필터링, 등록 기능 제공
  */
-export function CompanyToolbar({ totalCount, onCreateClick }: CompanyToolbarProps) {
+export function CompanyToolbar({ totalCount, onCreateClick, t }: CompanyToolbarProps) {
+  const _t = t || ((key: string) => {
+    const defaults: Record<string, string> = {
+      "company.toolbar.total": "총",
+      "company.toolbar.create": "회사 등록",
+    };
+    return defaults[key] || key;
+  });
+
   return (
     <div className="flex flex-col gap-4 lg:flex-row lg:items-center lg:justify-between">
       {/* 왼쪽: 카운트 정보 */}
       <div className="text-sm text-muted-foreground">
-        총 <span className="font-semibold text-foreground">{totalCount.toLocaleString()}</span> 건
+        {_t("company.toolbar.total")} <span className="font-semibold text-foreground">{totalCount.toLocaleString()}</span> 건
       </div>
 
       {/* 오른쪽: 등록 버튼 */}
       <Button onClick={onCreateClick} className="h-10 w-full gap-2 text-sm font-medium lg:w-auto">
         <Plus className="h-4 w-4" />
-        회사 등록
+        {_t("company.toolbar.create")}
       </Button>
     </div>
   );