英国签证材料的英文版还需要盖章吗？

If you submit a document that is not in English or Welsh, it must be accompanied by a full translation that can be independently verified by the Home Office. Each translated document must contain:
如果您提交的材料不是英语或威尔士语，则必须提交可以由内政部独立核查的完整翻译件。每份翻译件必须包括：

confirmation from the translator that it is an accurate translation of the original document;
译者确认该翻译件是对原始文件的准确翻译；（翻译宣誓）

the date of the translation;
翻译日期；

the translator's full name and signature; and
译者的全名和签名；以及
the translator's contact details.
译者的联系方式。

The submission of all or any of these documents does not guarantee that your application will
be successful.

即便你全都照做，也不能确保你会成功