Ukrainian language support for LearnHouse

LearnHouse is an open-source learning platform. I added Ukrainian language support to its web application.

What I changed

• Added a Ukrainian locale with all 3,752 keys from the English source locale.
• Registered the locale for lazy loading in the web app.
• Added Українська to the language selector and translated its label across the existing locales.
• Checked every locale file for valid JSON, missing keys, extra keys, and placeholder mismatches.

Result

The maintainers merged pull request #789 on June 12, 2026. LearnHouse users can now select Ukrainian in the application.