Chinese lang filename not match the sources code and some translations wrong

[Himmelt]

Describe the bug

Chinese Simplified lang file should be "zh-cn"/"zh_cn"/"zh_CN" but actual is "qt_zh_TW". And some translations was wrong with 1.1.7. For example, "Quit" should be "退出" but atual is "辞职", "Setup" should be "设置" but actual is "体系". However , I found it's right in sources code at https://github.com/Serial-Studio/Serial-Studio/blob/0a16c90acdde2e99a5e78dc158eae38cf0926c19/assets/translations/zh.ts#L1533-L1536 https://github.com/Serial-Studio/Serial-Studio/blob/0a16c90acdde2e99a5e78dc158eae38cf0926c19/assets/translations/zh.ts#L1831-L1834 So, just needs updating ?

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