openclaw - 💡(How to fix) Fix [Feature]: Translate Control UI chat panel (welcome, run controls, message placeholder) via i18n

Summary

The Control UI chat panel (welcome screen, run control buttons, message placeholder) uses hardcoded English strings, and the locale files are missing the corresponding translation keys.

Problem to solve

Three issues in the chat UI:

1. Welcome screen (ui/src/ui/chat/chat-welcome.ts): "Ready to chat" and hint text are hardcoded English, not using t()
2. Run controls (ui/src/ui/chat/run-controls.ts): All button tooltips (New session, Export, Send, Stop, Queue, Attach file) are hardcoded English title/aria-label attributes
3. Message input (ui/src/ui/views/chat.ts): Placeholder text like "Message {name} (Enter to send)" and talk button labels are hardcoded

Additionally, ui/src/i18n/locales/en.ts and ui/src/i18n/locales/zh-CN.ts are missing the chat.welcome.* translation keys needed by these components.

Proposed solution

1. In ui/src/i18n/locales/en.ts — add chat.welcome translation keys: ready, hint, attachFile, startTalk, newSession, exportChat, sendMessage, queueMessage, stopGenerating, stopTalk, messagePlaceholder, chatSession, chatModel, thinkingLevel
2. In ui/src/i18n/locales/zh-CN.ts — add the same keys with Chinese translations; also fix 6 instances where skills: "Skills" should be skills: "技能"
3. In ui/src/ui/chat/chat-welcome.ts — add import { t }, wrap strings with t()
4. In ui/src/ui/chat/run-controls.ts — add import { t }, wrap title/aria-label strings with t()
5. In ui/src/ui/views/chat.ts — wrap placeholder and talk button strings with t() (the import { t } already exists)

Alternatives considered

Could hardcode Chinese text in zh-CN.ts without adding English keys to en.ts, but that would break the pattern used elsewhere (English keys in en.ts are the source of truth).

Impact

• Affected: Chinese-speaking Control UI users; non-English users in general
• Severity: Low (cosmetic — buttons still work, text is just in English)
• Frequency: Every time a user opens the chat panel
• Consequence: Chinese users see English-only text for chat controls and welcome messages, even when the rest of the UI is in Chinese

Evidence/examples

Confirmed by reading current source: chat-welcome.ts line 69, run-controls.ts lines 25-76, views/chat.ts lines 808-1309 all have hardcoded English. Locale files en.ts and zh-CN.ts have no chat.welcome section.