[FEATURE] 支持翻译 PDF （用于看论文）

Before you begin

• I have searched existing issues to avoid duplicates
• I am willing to contribute a PR for this feature

Is your feature request related to a problem? Please describe.

我日常会用 Chrome 浏览 arxiv 上的论文，但论文很多时候是 PDF，我想借助于陪读蛙翻译 PDF。

Describe the solution you'd like

• 支持像翻译网页一样，翻译 PDF

Which area(s) would this feature affect? (Select all that apply)

Browser Extension

Additional context

No response