feat(ai): localize AI features

keep-notes/components/notebook-summary-dialog.tsx

@@ -52,7 +52,10 @@ export function NotebookSummaryDialog({
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         credentials: 'include',
-        body: JSON.stringify({ notebookId }),
+        body: JSON.stringify({
+          notebookId,
+          language: document.documentElement.lang || 'en',
+        }),
       })
 
       const data = await response.json()
@@ -82,6 +85,10 @@ export function NotebookSummaryDialog({
     return (
       <Dialog open={open} onOpenChange={onOpenChange}>
         <DialogContent className="max-w-2xl max-h-[80vh] overflow-y-auto">
+          <DialogHeader className="sr-only">
+            <DialogTitle>{t('notebook.generating')}</DialogTitle>
+            <DialogDescription>{t('notebook.generatingDescription') || 'Please wait...'}</DialogDescription>
+          </DialogHeader>
           <div className="flex flex-col items-center justify-center py-12">
             <Loader2 className="h-8 w-8 animate-spin text-primary" />
             <p className="mt-4 text-sm text-muted-foreground">