Follow-up to MGNLCTS-116. Module ui still needs porting to the new framework.
The changes at MGNLCTS-116 allow the module to work seamlessly with translation file import and export in both new and old apps. However, the classes under the package info.magnolia.translation.ui.action.ui still use the old framework and some feature, such as  https://documentation.magnolia-cms.com/display/DOCS62/Content+Translation+Support+module#ContentTranslationSupportmodule-Enablingcontenttranslationincontentapps do not work with the new UI definitions, due to custom fields.

ERROR inition.migration.FallbackFieldDefinitionConverter: No converter for old class info.magnolia.translation.ui.form.field.definition.TranslationFileFormatOptionGroupFieldDefinition. Falling back to class info.magnolia.ui.field.StaticFieldViewDefinition.