feat: prevent duplicate glossary presets + fix i18n source warning bug

- Add template_id column to Glossary model (nullable, indexed)
- Backend: return 409 Conflict if user already imported a template
- Frontend: disable preset cards already imported, show 'Imported' badge
- Fix duplicated text in GlossarySelector source warning (hardcoded FR text removed)
- Complete i18n migration for glossaries page and GlossarySelector
- Add glossaries.presets.alreadyImported key in all 13 locales

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

@@ -124,6 +124,8 @@ export default function GlossariesPage() {
             count: String(glossary?.terms?.length ?? 0),
           }),
         });
+      } else if (res.status === 409) {
+        toast({ title: t('glossaries.presets.alreadyImported') });
       } else {
         toast({ variant: 'destructive', title: t('glossaries.toast.error'), description: t('glossaries.toast.errorCreate') });
       }
@@ -417,21 +419,33 @@ export default function GlossariesPage() {
           </div>
 
           <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
-            {PRESETS.map((p) => {
+            {(() => {
+              const importedTemplateIds = new Set(
+                glossaries
+                  .map((g: GlossaryListItem) => g.template_id)
+                  .filter(Boolean) as string[]
+              );
+              return PRESETS.map((p) => {
               const Icon = p.icon;
               const isCreatingThis = creatingPreset === p.key;
+              const alreadyImported = importedTemplateIds.has(p.templateId);
               return (
                 <button
                   key={p.key}
-                  onClick={() => handleCreatePresetGlossary(p)}
-                  disabled={!!creatingPreset}
-                  className="p-4 bg-brand-muted/40 dark:bg-white/5 hover:bg-brand-accent/5 dark:hover:bg-brand-accent/10 border border-black/5 dark:border-white/5 rounded-xl text-left transition-all hover:border-brand-accent/30 cursor-pointer disabled:opacity-50 disabled:cursor-not-allowed group min-h-[105px] flex flex-col justify-between"
+                  onClick={() => !alreadyImported && handleCreatePresetGlossary(p)}
+                  disabled={!!creatingPreset || alreadyImported}
+                  className="relative p-4 bg-brand-muted/40 dark:bg-white/5 hover:bg-brand-accent/5 dark:hover:bg-brand-accent/10 border border-black/5 dark:border-white/5 rounded-xl text-left transition-all hover:border-brand-accent/30 cursor-pointer disabled:opacity-50 disabled:cursor-not-allowed group min-h-[105px] flex flex-col justify-between"
                 >
                   <div className="flex items-center justify-between mb-2">
                     <div className="p-1.5 bg-brand-accent/10 rounded-lg text-brand-accent group-hover:scale-110 transition-transform">
                       {isCreatingThis ? <Loader2 size={16} className="animate-spin" /> : <Icon size={16} />}
                     </div>
                     {isCreatingThis && <span className="text-[10px] text-brand-accent font-bold uppercase">{t('glossaries.presets.creating')}</span>}
+                    {alreadyImported && (
+                      <span className="flex items-center gap-1 text-[9px] font-bold uppercase tracking-wider text-emerald-600 dark:text-emerald-400 bg-emerald-500/10 px-2 py-0.5 rounded-full border border-emerald-500/20">
+                        <CheckCircle2 size={9} /> {t('glossaries.presets.alreadyImported')}
+                      </span>
+                    )}
                   </div>
                   <div>
                     <h4 className="text-xs font-bold text-brand-dark dark:text-white mb-1">
@@ -443,7 +457,8 @@ export default function GlossariesPage() {
                   </div>
                 </button>
               );
-            })}
+            });
+            })()}
           </div>
         </section>