fix(translate): ajout des cles de traduction manquantes et re-positionnement intelligent du bouton de traduction

frontend/src/app/dashboard/translate/page.tsx

@@ -184,7 +184,7 @@ export default function TranslatePage() {
   const qualityLabel = useMemo(() => getQualityLabel(t, config.provider), [t, config.provider]);
 
   return (
-    <div className="min-h-full p-6 lg:p-8 dark:bg-[#0a0a0a] selection:bg-brand-accent/10">
+    <div className="min-h-full p-6 pb-24 lg:pb-8 lg:p-8 dark:bg-[#0a0a0a] selection:bg-brand-accent/10">
       <div className="max-w-6xl mx-auto">
 
         {/* ── HEADER (Landing Page Style) ───────────────────────── */}
@@ -296,6 +296,44 @@ export default function TranslatePage() {
               </div>
             )}
 
+            {/* ── Desktop Submit Button & Actions (shown when not processing/complete) ── */}
+            {(showUpload || showConfiguring) && (
+              <div className="hidden lg:block editorial-card p-6 bg-white dark:bg-[#141414] border-none shadow-editorial space-y-4">
+                <button
+                  disabled={!config.isConfigValid || submit.isSubmitting || !upload.file}
+                  onClick={handleTranslate}
+                  className={cn(
+                    'w-full py-4 text-[10px] font-bold uppercase tracking-[0.25em] flex items-center justify-center gap-2 rounded-2xl transition-all shadow-sm active:scale-98',
+                    config.isConfigValid && upload.file && !submit.isSubmitting
+                      ? 'bg-brand-dark text-white hover:bg-brand-accent dark:bg-brand-accent dark:text-brand-dark hover:shadow-xl cursor-pointer'
+                      : 'bg-brand-muted/70 text-brand-dark/25 dark:bg-white/5 dark:text-white/20 cursor-not-allowed border border-black/[0.03] dark:border-white/[0.03]'
+                  )}
+                >
+                  {submit.isSubmitting ? (
+                    <><Loader2 className="size-4 animate-spin" /> {t('dashboard.translate.actions.uploading') || 'Soumission...'}</>
+                  ) : (
+                    <>Lancer la traduction <ArrowRight size={13} className={upload.file ? 'text-brand-accent' : 'opacity-20'} /></>
+                  )}
+                </button>
+
+                {!upload.file && (
+                  <p className="text-center text-[8px] text-brand-dark/30 dark:text-white/30 font-bold uppercase tracking-widest">{t('dashboard.translate.noFile') || 'Veuillez charger un fichier'}</p>
+                )}
+                {upload.file && !config.targetLang && (
+                  <p className="text-center text-[8px] text-brand-dark/30 dark:text-white/30 font-bold uppercase tracking-widest">{t('dashboard.translate.noTargetLang') || 'Veuillez choisir une langue cible'}</p>
+                )}
+
+                <div className="flex justify-between text-[7.5px] font-bold uppercase tracking-[0.15em] text-brand-dark/30 dark:text-white/30 border-t border-black/5 dark:border-white/5 pt-4">
+                  <span className="flex items-center gap-1.5">
+                    <ShieldCheck size={12} /> {t('landing.translate.zeroRetention') || 'Rétention Zéro'}
+                  </span>
+                  <span className="flex items-center gap-1.5">
+                    <Clock size={12} /> {t('landing.translate.filesDeleted') || 'Fichiers supprimés post-traitement'}
+                  </span>
+                </div>
+              </div>
+            )}
+
             {/* ── PROCESSING STATE: Rich progress ───────────────── */}
             {showProcessing && (
               <div className="editorial-card p-12 h-full border-none shadow-editorial bg-white dark:bg-[#141414] space-y-12">
@@ -570,41 +608,6 @@ export default function TranslatePage() {
                     )}
                   </div>
                 </div>
-
-                {/* ── TRANSLATE BUTTON — fixed at bottom, never scrolls away ── */}
-                <div className="shrink-0 p-6 pt-4 bg-white dark:bg-[#141414] border-t border-black/5 dark:border-white/5">
-                  <button
-                    disabled={!config.isConfigValid || submit.isSubmitting || !upload.file}
-                    onClick={handleTranslate}
-                    className={cn(
-                      'w-full py-4 text-[10px] font-bold uppercase tracking-[0.2em] flex items-center justify-center gap-2 rounded-2xl transition-all shadow-sm active:scale-98',
-                      config.isConfigValid && upload.file && !submit.isSubmitting
-                        ? 'bg-brand-dark text-white hover:bg-brand-accent dark:bg-brand-accent dark:text-brand-dark hover:shadow-xl cursor-pointer'
-                        : 'bg-brand-muted/70 text-brand-dark/25 dark:bg-white/5 dark:text-white/20 cursor-not-allowed border border-black/[0.03] dark:border-white/[0.03]'
-                    )}
-                  >
-                    {submit.isSubmitting ? (
-                      <><Loader2 className="size-4 animate-spin" /> Soumission...</>
-                    ) : (
-                      <>Lancer la traduction <ArrowRight size={13} className={upload.file ? 'text-brand-accent' : 'opacity-20'} /></>
-                    )}
-                  </button>
-                  {!upload.file && (
-                    <p className="text-center text-[8px] text-brand-dark/30 dark:text-white/30 mt-2.5 font-bold uppercase tracking-widest">↑ Veuillez charger un fichier pour commencer</p>
-                  )}
-                  {upload.file && !config.targetLang && (
-                    <p className="text-center text-[8px] text-brand-dark/30 dark:text-white/30 mt-2.5 font-bold uppercase tracking-widest">↑ Veuillez choisir une langue cible</p>
-                  )}
-                </div>
-
-                <div className="shrink-0 flex justify-between px-6 pb-5 pt-1 text-[7.5px] font-bold uppercase tracking-[0.15em] text-brand-dark/30 dark:text-white/30">
-                  <span className="flex items-center gap-1.5">
-                    <ShieldCheck size={12} /> {t('landing.translate.zeroRetention') || 'Rétention Zéro'}
-                  </span>
-                  <span className="flex items-center gap-1.5">
-                    <Clock size={12} /> {t('landing.translate.filesDeleted') || 'Fichiers supprimés post-traitement'}
-                  </span>
-                </div>
               </div>
             )}
 
@@ -747,6 +750,28 @@ export default function TranslatePage() {
             </div>
           </div>
         )}
+
+        {/* Mobile Sticky Action Bar (visible on mobile, hidden on lg) */}
+        {(showUpload || showConfiguring) && (
+          <div className="block lg:hidden fixed bottom-0 left-0 right-0 z-40 p-4 bg-white/90 dark:bg-[#141414]/90 backdrop-blur-md border-t border-black/5 dark:border-white/5 shadow-lg">
+            <button
+              disabled={!config.isConfigValid || submit.isSubmitting || !upload.file}
+              onClick={handleTranslate}
+              className={cn(
+                'w-full py-4 text-[10px] font-bold uppercase tracking-[0.2em] flex items-center justify-center gap-2 rounded-xl transition-all active:scale-98',
+                config.isConfigValid && upload.file && !submit.isSubmitting
+                  ? 'bg-brand-dark text-white hover:bg-brand-accent dark:bg-brand-accent dark:text-brand-dark cursor-pointer'
+                  : 'bg-brand-muted/70 text-brand-dark/25 dark:bg-white/5 dark:text-white/20 cursor-not-allowed'
+              )}
+            >
+              {submit.isSubmitting ? (
+                <><Loader2 className="size-4 animate-spin" /> {t('dashboard.translate.actions.uploading') || 'Soumission...'}</>
+              ) : (
+                <>Lancer la traduction <ArrowRight size={13} className={upload.file ? 'text-brand-accent' : 'opacity-20'} /></>
+              )}
+            </button>
+          </div>
+        )}
       </div>
     </div>
   );

frontend/src/lib/i18n.tsx

@@ -195,6 +195,11 @@ const messages: Record<Locale, Record<string, string>> = {
     "dashboard.translate.provider.upgrade": "Upgrade to Pro",
     "dashboard.translate.provider.upgradeSuffix":
       "to unlock AI translation",
+    "dashboard.translate.provider.tabStandard": "Standard",
+    "dashboard.translate.provider.tabLLM": "AI Multi-Models",
+    "translate.glossary.selectGlossary": "Select a glossary...",
+    "dashboard.translate.translateImages": "Translate images",
+    "dashboard.translate.translateImagesDesc": "Extract and translate text inside images (vision required)",
     "dashboard.translate.trust.zeroRetention": "Zero retention",
     "dashboard.translate.trust.deletedAfter":
       "Files deleted after processing",
@@ -1004,6 +1009,11 @@ const messages: Record<Locale, Record<string, string>> = {
     "dashboard.translate.provider.upgrade": "Passer Pro",
     "dashboard.translate.provider.upgradeSuffix":
       "pour débloquer la traduction IA",
+    "dashboard.translate.provider.tabStandard": "Standard",
+    "dashboard.translate.provider.tabLLM": "Multi-Modèles IA",
+    "translate.glossary.selectGlossary": "Sélectionner un glossaire...",
+    "dashboard.translate.translateImages": "Traduire les images",
+    "dashboard.translate.translateImagesDesc": "Extraire et traduire le texte des images (vision requise)",
     "dashboard.translate.trust.zeroRetention": "Rétention zéro",
     "dashboard.translate.trust.deletedAfter":
       "Fichiers supprimés après traitement",