i18n: Fix Username Highlighting Issue in Russian Language Mentions

[SinghaAnirban005]

This PR addresses a bug where usernames mentioned with the @ symbol are not highlighted when the user’s language is set to Russian. This issue occurs in system messages, such as those generated by Rocket.Cat, and prevents proper highlighting of the @username mention in Russian.

Changes:

Adjusted the JSON file of Russian translations to render highlighted username
Tested the fix with both Russian and English language settings to confirm consistency.

Screenshots:

Before

After

Issue(s)

Closes #33793

Further comments

This fix ensures that users in Russian-speaking regions experience the same usability as other language settings, where mentions are correctly highlighted. Further testing might be beneficial to confirm no issues with other languages.

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