Currently it support english and partial translations for german for stencils. You can see how the translation is done for the bpmn2 stencil set for example at
https://github.com/tsurdilo/process-designer/blob/master/src/main/webapp/stencilsets/bpmn2.0drools/bpmn2.0drools.json
and
https://github.com/tsurdilo/process-designer/blob/master/src/main/webapp/stencilsets/bpmn2.0drools/bpmn2.0droolsconversation.json.
Thanks.
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