feat(theme): adds Ukrainian default theme translations

[b-ovsepian]

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Motivation

Adds Ukrainian translations

Test Plan

Test links

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 94	🟢 98	🟢 100	🟢 100	🟠 80	Report
/docs/installation	🟠 83	🟢 100	🟢 100	🟢 100	🟢 90	Report

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[slorber]

Thanks @b-ovsepian , can't really review that but it looks better than before so I'll merge it

If anyone is able to review, please comment or submit another PR

Note we have 50% translations on Ukr. I plan to activate the Ukrainian site later but need to figure out first some changes so that adding a new language does not increase build time