@tendomart, openmrs-core is already configured (but disabled) at https://www.transifex.com/openmrs/OpenMRS/openmrs-core/ I guess we can turn this on once you’re ready for that.
It seems that openmrs-standalone is not actually i18n-able, i.e. there’s no messages.properties file anywhere. Can you tell from the ticket or discussion thread whether that was a real need from someone, or whether I imagined it?