fix: Optimize internationalization configuration #3221 (#9924)

### What problem does this PR solve?

fix: Optimize internationalization configuration

- Update multi-language options, adding general translations for
functions like Select All and Clear
- Add internationalization support for modules like Chat, Search, and
Datasets

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/next-chats/chat/sessions.tsx

@@ -71,7 +71,7 @@ export function Sessions({
       </section>
       <div className="flex justify-between items-center mb-4 pt-10">
         <div className="flex items-center gap-3">
-          <span className="text-base font-bold">Conversations</span>
+          <span className="text-base font-bold">{t('chat.conversations')}</span>
           <span className="text-text-secondary text-xs">
             {conversationList.length}
           </span>