feat(i18n): migrate hardcoded German strings to t() across 104 components/pages — AST-based batch with re-parse gate, 423 new de.json keys; tsc clean; vitest failures byte-identical to clean-tree baseline (pre-existing)

frontend/src/components/shared/ActivityFeed.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Card } from '@/components/ui/Card';
 import { Avatar } from '@/components/ui/Avatar';
+import { useTranslation } from 'react-i18next';
 
 export interface ActivityItem {
   id: string;
@@ -17,11 +18,12 @@ export interface ActivityFeedProps {
 }
 
 export function ActivityFeed({ activities, title = 'Letzte Aktivitäten', maxItems = 10 }: ActivityFeedProps) {
+  const { t } = useTranslation();
   const visible = activities.slice(0, maxItems);
   return (
     <Card title={title} data-testid="activity-feed">
       {visible.length === 0 ? (
-        <p className="text-sm text-secondary-500 py-4 text-center">Keine Aktivitäten vorhanden.</p>
+        <p className="text-sm text-secondary-500 py-4 text-center">{t('activityFeed.keineaktivitätenvorhanden')}</p>
       ) : (
         <ul className="space-y-3" role="list">
           {visible.map((activity) => (

frontend/src/components/shared/DataGrid.tsx

@@ -112,7 +112,7 @@ export function DataGrid<T extends Record<string, any>>({
         ref={scrollRef}
         className="overflow-x-auto"
         role="region"
-        aria-label="Data grid"
+        aria-label={t('dataGrid.datagrid')}
         style={shouldVirtualize ? { maxHeight: '70vh', overflowY: 'auto' } : undefined}
       >
         <table className="min-w-full divide-y divide-secondary-200">

frontend/src/components/shared/SearchDropdown.tsx

@@ -143,7 +143,7 @@ export function SearchDropdown({ placeholder }: SearchDropdownProps) {
                   onClick={handleSeeAll}
                   className="text-sm text-primary-600 hover:text-primary-700 font-medium min-h-touch"
                 >
-                  Alle Ergebnisse anzeigen →
+                  {t('searchDropdown.alleergebnisseanzeigen')}
                 </button>
               </div>
             </>

frontend/src/components/shared/TeamPanel.tsx

@@ -10,12 +10,14 @@ import React from 'react';
 import { Users } from 'lucide-react';
 import { useUsers, useGroups } from '@/api/hooks';
 import { Avatar } from '@/components/ui/Avatar';
+import { useTranslation } from 'react-i18next';
 
 interface SharedTeamPanelProps {
   onStartDirectChat?: (userId: string, userName: string) => void;
 }
 
 export function SharedTeamPanel({ onStartDirectChat }: SharedTeamPanelProps) {
+  const { t } = useTranslation();
   const { data: usersData, isLoading: usersLoading } = useUsers();
   const { data: groupsData, isLoading: groupsLoading } = useGroups();
   const users: any[] = usersData?.items || [];
@@ -28,7 +30,7 @@ export function SharedTeamPanel({ onStartDirectChat }: SharedTeamPanelProps) {
         {usersLoading ? (
           <p className="text-sm text-secondary-400">Laden...</p>
         ) : users.length === 0 ? (
-          <p className="text-sm text-secondary-400">Keine Mitarbeiter</p>
+          <p className="text-sm text-secondary-400">{t('teamPanel.keinemitarbeiter')}</p>
         ) : (
           <div className="space-y-1">
             {users.map((u) =>
@@ -40,7 +42,7 @@ export function SharedTeamPanel({ onStartDirectChat }: SharedTeamPanelProps) {
                 >
                   <div className="relative flex-shrink-0">
                     <Avatar name={u.name} size="sm" />
-                    <span className="absolute bottom-0 right-0 w-2.5 h-2.5 rounded-full border-2 border-white bg-secondary-300" aria-label="offline" />
+                    <span className="absolute bottom-0 right-0 w-2.5 h-2.5 rounded-full border-2 border-white bg-secondary-300" aria-label={t('teamPanel.offline')} />
                   </div>
                   <div className="flex-1 min-w-0">
                     <p className="text-sm font-medium text-secondary-700 truncate">{u.name}</p>
@@ -52,7 +54,7 @@ export function SharedTeamPanel({ onStartDirectChat }: SharedTeamPanelProps) {
                 <div key={u.id} className="flex items-center gap-2 px-2 py-1.5 rounded-lg hover:bg-secondary-50 transition-colors">
                   <div className="relative flex-shrink-0">
                     <Avatar name={u.name} size="sm" />
-                    <span className="absolute bottom-0 right-0 w-2.5 h-2.5 rounded-full border-2 border-white bg-secondary-300" aria-label="offline" />
+                    <span className="absolute bottom-0 right-0 w-2.5 h-2.5 rounded-full border-2 border-white bg-secondary-300" aria-label={t('teamPanel.offline')} />
                   </div>
                   <div className="flex-1 min-w-0">
                     <p className="text-sm font-medium text-secondary-700 truncate">{u.name}</p>
@@ -70,7 +72,7 @@ export function SharedTeamPanel({ onStartDirectChat }: SharedTeamPanelProps) {
         {groupsLoading ? (
           <p className="text-sm text-secondary-400">Laden...</p>
         ) : groups.length === 0 ? (
-          <p className="text-sm text-secondary-400">Keine Gruppen</p>
+          <p className="text-sm text-secondary-400">{t('teamPanel.keinegruppen')}</p>
         ) : (
           <div className="space-y-1">
             {groups.map((g) => (