fix: add useTranslations for "selected emails" and "cancel" on email list batch operations

components/email/email-list.tsx

@@ -275,7 +275,7 @@ export function EmailList({
         <div className="px-4 py-2 border-b bg-accent/30 border-border flex items-center justify-between">
           <div className="flex items-center gap-2 animate-in fade-in slide-in-from-left-3 duration-300">
             <span className="text-sm font-medium text-foreground">
-              {selectedEmailIds.size} {selectedEmailIds.size === 1 ? 'email' : 'emails'} selected
+              {t('batch_actions.selected_messages', { count: selectedEmailIds.size })}
             </span>
           </div>
           <div className="flex items-center gap-1 animate-in fade-in slide-in-from-right-3 duration-300">
@@ -330,7 +330,7 @@ export function EmailList({
               disabled={isProcessing}
               className="text-muted-foreground hover:text-foreground transition-colors disabled:opacity-50"
             >
-              Cancel
+              {t('batch_actions.clear_selection')}
             </Button>
           </div>
         </div>