Hi @SN4S. As promised here #2 (comment) I've added localization guide into repository.
Please check it - https://github.com/NEK-RA/flutter_material_palette/blob/main/Localization.md
If it's ok - please update your fork, add translation (as described in first part of guide) and create new pull request for that. Please notice that finally there is required only intl_uk_UA.arb file and small changes to lib/locale.dart.
If something is not clear to you - please provide feedback about guide - I'll try to improve it :)