Feat: Translate the maxRounds field of the chat settings #3221 (#10010)

### What problem does this PR solve?

Feat: Translate the maxRounds field of the chat settings #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/next-chats/chat/app-settings/dynamic-variable.tsx

@@ -42,9 +42,9 @@ export function DynamicVariableForm() {
         </Button>
       </div>
       <div className="flex gap-2 pr-12 text-text-secondary text-xs">
-        <span className="flex-1">Key</span>
+        <span className="flex-1">{t('chat.key')}</span>
         <span className="w-3"></span>
-        <span className="flex-1">Optional</span>
+        <span className="flex-1">{t('chat.optional')}</span>
       </div>
       <div className="space-y-5">
         {fields.map((field, index) => {