[Feature] Russian Lang

### Description / 功能描述

Hi. I can make Russian lang for the next version. But I'm waiting for your new release of Element so that it can be translated into Russian as well.

### Motivation / 请求动机

Have Russian language

### Miscellaneous / 其他

_No response_

### Contribution / 贡献代码

- [x] I am interested in contributing a PR for this! / 我乐意为此提交代码并发起 PR！

The issue requests Russian language support and refers to the next Element release, but names no files, translation resources, or tests. First check the current Element release status and how existing language translations are organized. Done means Russian is available in the intended release.

Written by the indexing model from the issue text.