All dropdown boxes on e.g. http://i18n.mbsandbox.org/edit/relationship/edit?returnto=http%3A%2F%2Fi18n.mbsandbox.org%2Fartist%2F8d2b70fb-a338-4702-8ce2-3211a4704d6f%2Frelationships&type1=recording&type0=artist&id=635256 and http://i18n.mbsandbox.org/edit/relationship/edit?returnto=http%3A%2F%2Fi18n.mbsandbox.org%2Frelease%2F1eb7830f-74a1-485c-ad84-f7d397d2e2ba&type1=url&type0=release&id=759907 are untranslated, even if the strings are translated in the relationships domain. Gettext domain unspecified for those strings?