feat: Add internationalization (i18n) support for Gradio demo #335
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Summary:
Add i18n support for English and Chinese languages
Implement dynamic language switching in the Gradio UI
Extract all UI text strings to JSON configuration files
Changes:
Created i18n infrastructure with load_i18n() function to load language files
Added demo/i18n/en.json and demo/i18n/zh.json for English and Chinese translations
Added language switcher dropdown in the UI
Refactored all hardcoded UI strings to use i18n text variables
Updated all button labels, prompts, error messages, and page info to support dynamic language switching