i18n: update string formater

[Samk13]

❤️ Thank you for your contribution!

Description

• fix wrong import
• replace .format() with %()s
• related to Untranslatable max length in schema invenio-communities#1370

AI use disclosure: Most of this PR was generated with Codex, with additional guidance, cleanup, and adjustments to match the existing codebase style.

Checklist

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• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
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• I've marked translation strings.
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