AO3-6870 Update proxy notice to include Russian, Ukranian translations

[slavalamp]

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• Have you added tests for any changed functionality?
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Issue

https://otwarchive.atlassian.net/browse/AO3-6870

Purpose

Adds proxy notices in Russian and Ukrainian, which might be useful for proxies that seem to be designed to get around Russian blocks

Testing Instructions

See Jira issue

References

n/a

Credit

slavalamp (they/them)

[Bilka2]

Could you reorder the proxy notices in the HTML file so that the non-English versions are ordered alphabetically by shortcode?

[Bilka2]

Thank you!