sonata-project/translation-bundle

config/packages/sonata_translation.yaml

sonata_admin:
    assets:
        extra_stylesheets:
            - bundles/sonatatranslation/css/sonata-translation.css

sonata_block:
    blocks:
        sonata_translation.block.locale_switcher: null

sonata_translation:
    locales: ['en']
    default_locale: 'en'