Implement Chinese and English internationalization (i18n) support using i18next#144

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copilot/fix-ffacb6d1-e481-48f4-9423-39ed676efc04

Commits on Jun 4, 2025

Initial plan for issue
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Initial plan for implementing i18n internationalization with i18next

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Add i18next internationalization support with language resource files and components

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Improve i18n language detection and add CSS styling for language switcher

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Fix linting issues in VariableItem and NoticeContainer components

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Add German, French, and Korean language support to i18n system

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Commits on Jun 6, 2025

Remove Korean language support from i18n system

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