[Feature request]: [i18n] Add multilingual support for CLI tool

[fatinghenji]

What do you need?

Problem Statement
Non-English users face friction due to:

• Inability to understand command help/errors without translation tools
• Misaligned text rendering in CJK terminals
• No adherence to LC_ALL environment variables

Proposed Solution

1. Core Features

   • --lang flag with auto-detection (fallback to English)
   • Translated content for:
     • Command help texts
     • Interactive prompts
     • Error messages with solution links

2. Priority Languages

   Phase 1: Simplified Chinese (zh_CN)  
   Phase 2: Spanish (es_ES), Japanese (ja_JP)  
   Phase 3: Community-driven translations
   

3. Requirements

   • [ ] All terminal output goes through i18n layer
   • [ ] Support width-aware text formatting for CJK
   • [ ] Add locale configuration to user profiles
   • [ ] Document translation contribution process

Acceptance Criteria

Scenario: Non-English command execution  
  Given the system language is zh_CN  
  When user runs `mycli deploy --help`  
  Then output shows Chinese help text  
  And text columns maintain terminal alignment  

Measurement

• 90% reduction in --help > translate searches (via user analytics)
• 40% decrease in misconfigured command errors