Feature Request: i18n / Multi-Language Support for System Messages

Problem

Currently, all system-level messages generated by Hermes Agent are hardcoded in English — interrupt notices (⚡ Interrupting current task...), tool approval prompts (⚠️ Dangerous command requires approval...), background process notifications, error messages, etc. For non-English-speaking users (e.g., Chinese), this creates an inconsistent experience: the agent responds fluently in Chinese, but system messages drop into English mid-conversation.

Proposed Solution

Add i18n support for system messages:

1. Extract all user-facing system strings into locale files (e.g., locales/zh_CN.yaml, locales/ja.yaml)
2. Auto-detect locale from the user's OS language ($LANG) or config.yaml setting
3. Fallback to English when a locale is unavailable
4. Phase 1 scope: gateway system messages, interrupt notices, tool approval prompts, cron delivery headers

Affected Components

• Gateway interrupt/pause/resume messages
• Tool approval / dangerous command confirmation prompts
• Cron job delivery formatting
• Error and timeout messages
• Memory save confirmation messages

Example

# Now:
"⚡ Interrupting current task (2 min elapsed, iteration 2/90). I will respond to your message shortly."

# Expected (zh_CN):
"⚡ 正在中断当前任务（已运行 2 分钟，第 2/90 轮）。稍后回复你的消息。"

Additional Context

• User base includes multiple non-English platforms (Weixin/WeChat, DingTalk, Feishu, QQ Bot)
• The agent already correctly switches to the user's preferred language for conversation responses
• System prompt could include locale preference for full-system i18n