How do we translate our local OpenMRS installation?

How would one go translating their local openmrs instance . Tried custom messages on 1.9.9 from @raff but it doesnt work

IT throws this error

 A javascript error has occurred: null, Field value should be synchronized, but uuid is null. Field Type: org.hibernate.type.ManyToOneType(org.openmrs.module.custommessage.MessagesLocation) Field Name: messageLocation
The full stacktrace for this error can usually be found in your server's error logs. Hide error

What exactly did you do?

Let me try and reproduce the same error now