That would be great. Here are the main two files to be translated:
https://github.com/droolsjbpm/jbpm-designer/tree/master/src/main/webapp/i18n
- notice there are some there but except _en and _ja none have been revised so far to be included
- to add a new locale start by copying the translation_en.js
https://github.com/droolsjbpm/jbpm-designer/blob/master/src/main/webapp/stencilsets/bpmn2.0jbpm/stencildata/bpmn2.0jbpm.orig
-- this is the big one :) it includes ttext for the bpmn2 stencil set (nodes and their properties that we use)
There is currently still some hard-coded text in teh code but we are weeding those out as we go..don't worry about those now.
Hope this helps and thanks for any contributions!