Motivation:
The language switcher's change event listener was never registered because () does not support an initialization callback as its 4th argument. Additionally, the Chinese translation for 'LLM Manager' was inaccurate (模型管家).
Implementation:
1. Replaced the unsupported callback with an IIFE to manually create the select element, set its value, and add the 'change' event listener.
2. Updated 'I18N_DICT' to change '模型管家' to 'LLM 管理器' for better accuracy.
科林_Cyril Pilgrim
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