Add Ukrainian language support across the application

[ussaama]

• Updated localization files to include Ukrainian (uk-UA) translations.
• Enhanced language picker and configuration to support Ukrainian.
• Integrated Ukrainian language into date formatting and participant onboarding flows.
• Added relevant onboarding cards and verification instructions in Ukrainian.

This update improves accessibility for Ukrainian-speaking users and ensures a more inclusive experience across the platform.

[coderabbitai]

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✨ Finishing Touches

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• Commit unit tests in branch add-ukranian-support

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