Button Text in Language Tab

Description
The button text in the Language tab lacks consistent capitalization. Additionally, some of the languages are displayed in their native script/style while others are in English, leading to inconsistency in presentation.

Describe the solution you'd like

The first letter of every word in the button text should be capitalized (e.g., "Swedish" instead of "swedish") for consistency.
Language names should either be uniformly displayed in their native script/style or in English, with clear guidelines applied across the tab.

从 Language 标签页的 UI 入手，找到按钮标签和语言名称数据。检查当前标签的来源，并选择一致的大小写和语言显示约定；当每个按钮都遵循相同的措辞和语言呈现规则时，即表示完成。

由索引模型根据 Issue 内容生成。