fix(frontend): i18n reactive badges + aria-labels + ExportEngagementButton + noMatch (review polish)

- ExportEngagementButton: full i18n (export.btn, export.btnLoading, export.aria)
- Layout: aria-label nav.brandHome on brand link, nav.themeAria on theme button
- SimulationList: aria-label simulation.list.rowActions on chevron button
- C2TasksPanel: aria-label c2.tasks.col.expand on expand column header
- ImportC2HistoryModal: aria-label common.select on select column header
- MitreMatrixModal: common.collapse/expand interpolated aria-label + mitre.matrix.noMatch
- fr.json: new keys common.expand/collapse/select, nav.brandHome/themeAria, export.*, simulation.list.rowActions, mitre.matrix.noMatch, c2.tasks.col.expand

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/C2TasksPanel.tsx

@@ -57,7 +57,7 @@ export function C2TasksPanel({ simulationId }: C2TasksPanelProps): JSX.Element {
           <table className="w-full text-[14px]">
             <thead>
               <tr className="bg-cloud border-b border-hairline">
-                <th className="px-md py-sm text-left font-medium text-ink w-8" aria-label="Expand" />
+                <th className="px-md py-sm text-left font-medium text-ink w-8" aria-label={t('c2.tasks.col.expand')} />
                 <th className="px-md py-sm text-left font-medium text-ink">{t('c2.tasks.col.task')}</th>
                 <th className="px-md py-sm text-left font-medium text-ink">{t('c2.tasks.col.command')}</th>
                 <th className="px-md py-sm text-left font-medium text-ink">{t('c2.tasks.col.source')}</th>

frontend/src/components/ExportEngagementButton.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useRef, useState } from 'react';
 import { ChevronDown, Download } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
 import { downloadEngagementExport, type ExportFormat } from '@/api/exports';
 import { useToast } from '@/hooks/useToast';
 
@@ -14,6 +15,7 @@ const FORMATS: { label: string; value: ExportFormat }[] = [
 ];
 
 export function ExportEngagementButton({ engagementId }: ExportEngagementButtonProps): JSX.Element {
+  const { t } = useTranslation();
   const { push } = useToast();
   const [open, setOpen] = useState(false);
   const [loading, setLoading] = useState<ExportFormat | null>(null);
@@ -58,11 +60,11 @@ export function ExportEngagementButton({ engagementId }: ExportEngagementButtonP
           onClick={() => setOpen((v) => !v)}
           data-testid="export-btn"
         >
-          <Download size={14} aria-hidden /> Export
+          <Download size={14} aria-hidden /> {t('export.btn')}
         </button>
         <button
           type="button"
-          aria-label="Export options"
+          aria-label={t('export.aria')}
           aria-expanded={open}
           className="btn-outline px-sm"
           onClick={() => setOpen((v) => !v)}
@@ -89,7 +91,7 @@ export function ExportEngagementButton({ engagementId }: ExportEngagementButtonP
             >
               {loading === value ? (
                 <span className="font-mono text-[11px] animate-pulse" aria-hidden>
-                  EXPORTING…
+                  {t('export.btnLoading')}
                 </span>
               ) : null}
               {loading !== value ? label : null}

frontend/src/components/ImportC2HistoryModal.tsx

@@ -140,7 +140,7 @@ export function ImportC2HistoryModal({
                   <table className="w-full text-[14px]">
                     <thead>
                       <tr className="bg-cloud border-b border-hairline">
-                        <th className="px-md py-sm w-8" aria-label="Select" />
+                        <th className="px-md py-sm w-8" aria-label={t('common.select')} />
                         <th className="px-md py-sm text-left font-medium text-ink">#</th>
                         <th className="px-md py-sm text-left font-medium text-ink">{t('c2.tasks.col.command')}</th>
                         <th className="px-md py-sm text-left font-medium text-ink">{t('c2.tasks.col.status')}</th>

frontend/src/components/Layout.tsx

@@ -43,7 +43,7 @@ export function Layout(): JSX.Element {
               <button
                 type="button"
                 onClick={cycleTheme}
-                aria-label={`Theme: ${themeLabel(theme)} — click to cycle`}
+                aria-label={t('nav.themeAria', { label: themeLabel(theme) })}
                 className="flex items-center gap-xxs text-[12px] text-slab-muted hover:text-slab-text"
               >
                 <ThemeIcon theme={theme} />
@@ -64,7 +64,7 @@ export function Layout(): JSX.Element {
       {/* nav-bar-top — fixed dark slab, never inverts (same visual family as utility-strip + footer) */}
       <header className="bg-slab text-slab-text">
         <div className="mx-auto w-full max-w-page px-xl h-16 flex items-center justify-between">
-          <Link to="/engagements" className="flex items-center gap-sm" aria-label="Mimic home">
+          <Link to="/engagements" className="flex items-center gap-sm" aria-label={t('nav.brandHome')}>
             <span className="inline-block h-6 w-6 rotate-12 bg-primary" aria-hidden />
             <span className="text-[20px] font-medium tracking-tight text-slab-text">Mimic</span>
           </Link>

frontend/src/components/MitreMatrixModal.tsx

@@ -278,7 +278,7 @@ export function MitreMatrixModal({
                               {hasSubtechniques ? (
                                 <button
                                   type="button"
-                                  aria-label={isExpanded ? `Collapse ${tech.id}` : `Expand ${tech.id}`}
+                                  aria-label={isExpanded ? t('common.collapse', { id: tech.id }) : t('common.expand', { id: tech.id })}
                                   onClick={() => toggleExpand(tech.id)}
                                   className={`mr-[2px] flex-shrink-0 text-[9px] w-3 leading-none mt-[1px] ${
                                     isSelected ? 'text-white' : 'text-graphite'
@@ -329,7 +329,7 @@ export function MitreMatrixModal({
                         );
                       })}
                       {visibleTechniques.length === 0 && searchLower && (
-                        <div className="px-xs py-xxs text-[10px] text-graphite italic">No match</div>
+                        <div className="px-xs py-xxs text-[10px] text-graphite italic">{t('mitre.matrix.noMatch')}</div>
                       )}
                     </div>
                   </div>

frontend/src/components/SimulationList.tsx

@@ -79,7 +79,7 @@ function NewSimulationDropdown({ engagementId }: { engagementId: number }): JSX.
         </button>
         <button
           type="button"
-          aria-label="More options"
+          aria-label={t('simulation.list.rowActions')}
           aria-expanded={open}
           className="btn-primary px-sm"
           onClick={() => setOpen((v) => !v)}

frontend/src/i18n/fr.json

@@ -16,7 +16,10 @@
     "close": "Fermer",
     "confirm": "Confirmer",
     "yes": "Oui",
-    "no": "Non"
+    "no": "Non",
+    "expand": "Déplier {{id}}",
+    "collapse": "Replier {{id}}",
+    "select": "Sélectionner"
   },
   "nav": {
     "engagements": "Engagements",
@@ -24,8 +27,15 @@
     "users": "Utilisateurs",
     "signOut": "Se déconnecter",
     "brand": "Mimic",
+    "brandHome": "Accueil Mimic",
+    "themeAria": "Thème : {{label}} — cliquer pour changer",
     "footer": "Mimic — Outillage interne Purple Team. Engagements autorisés uniquement."
   },
+  "export": {
+    "btn": "Exporter",
+    "btnLoading": "Export en cours…",
+    "aria": "Options d'export"
+  },
   "auth": {
     "login": {
       "title": "Mimic",
@@ -208,7 +218,8 @@
         "desc": "Créez votre première simulation pour cet engagement."
       },
       "new": "Nouvelle simulation",
-      "error": "Impossible de charger les simulations"
+      "error": "Impossible de charger les simulations",
+      "rowActions": "Plus d'options"
     }
   },
   "template": {
@@ -382,7 +393,8 @@
         "command": "Commande",
         "source": "Source",
         "status": "Statut",
-        "completedAt": "Terminé le"
+        "completedAt": "Terminé le",
+        "expand": "Déplier"
       },
       "refreshing": "Actualisation…"
     },
@@ -464,7 +476,8 @@
       "applyItem_other": "Appliquer ({{count}} éléments)",
       "clearAll": "Tout effacer",
       "close": "Fermer",
-      "retry": "Réessayer"
+      "retry": "Réessayer",
+      "noMatch": "Aucun résultat"
     },
     "field": {
       "empty": "Aucune technique associée.",

frontend/tests/ExportEngagementButton.test.tsx

@@ -47,7 +47,7 @@ describe('ExportEngagementButton', () => {
     renderWithProviders(<ExportEngagementButton engagementId={1} />);
     expect(screen.getByTestId('export-btn')).toBeInTheDocument();
     expect(screen.getByTestId('export-dropdown-toggle')).toBeInTheDocument();
-    expect(screen.getByText('Export')).toBeInTheDocument();
+    expect(screen.getByText('Exporter')).toBeInTheDocument();
   });
 
   it('clicking primary opens dropdown with three formats', async () => {

frontend/tests/MitreMatrixModal.test.tsx

@@ -224,7 +224,7 @@ describe('MitreMatrixModal', () => {
     await waitFor(() => screen.getByText('T1078'));
     expect(screen.queryByText(/Default Accounts/)).toBeNull();
 
-    const expandBtn = screen.getByRole('button', { name: /Expand T1078/i });
+    const expandBtn = screen.getByRole('button', { name: /Déplier T1078/i });
     await user.click(expandBtn);
 
     expect(screen.getByText(/Default Accounts/)).toBeInTheDocument();