fix: Username highlight issue in notifications when user language is set to Russian

[KUSHAL-BANKHEDE]

Issue: The issue (#33793) describes a problem where usernames in notifications are not highlighted correctly when the user's language is set to Russian.

Proposed Changes: The PR likely modifies the translation string for the notification message to ensure proper username highlighting.

Key Changes
The main change in this PR is updating the translation string for the Russian language. Specifically:

The old string: "Username_is_already_in_here": ""@%s" уже здесь."

The new string: "Username_is_already_in_here": "@%s уже здесь."

This change replaces double quotes (") with backticks (`) around the username placeholder (@%s) to ensure proper rendering and highlighting in notifications.

Why This Fix Works
The backticks (`) ensure that the username is rendered as a code block or highlighted text in notifications.

This prevents issues with escaping double quotes (") in the notification message, which can cause rendering problems.

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[Gustrb]

hey, I think we could also tacle a different issue in the translation, in russian we don't use quotes, they use: «Name» уже здесь