Two changes to be made: in EventLogging.php
remove mediawiki.product_metrics.mint_for_readers and add mediawiki.product_metrics.translation_mint_for_readers
remove mediawiki.product_metrics.mint_for_readers and the corresponding config, and add config for mediawiki.product_metrics.translation_mint_for_readers
schemaID for the new schema will be /analytics/product_metrics/web/translation/1.0.0
schema_title will be analytics/product_metrics/web/translation
For related changes on the instrumentation side, please check T376017