If an i18n text (e.g. label) is specified in configuration, and one of the generated keys has a translation, the specified text is ignored, and a translation for the generated key is used.

E.g. if you have a commit action in a dialog and you "hardcode" a label for it in configuration (e.g. to "Save My Changes"), it is always ignored, as one of the keys from the ActionDefinitionKeyGenerator is action.commit.label, whose translation is specified in admincentral's mgnl-i18n/messages_en.properties bundle, thus this translation ("save changes") is used, overriding the specified value.