In many of the Umple templates, like Java's association_set_specialization_reqSuperCode.ump, in the code blocks there are strings with `.jet'.
Since this references to JET could be confusing after conversion to Umple templates is complete, it would be a good idea to add an argument to the converter to remove .jet from strings, or convert it to .ump.
I do not think it would be possible to simply change/remove all references to .jet in code blocks since there could also be packages that contain .jet.