[Regression 15.3 ] HippoTaxonomyVisitor doesn't populate data properly

-HippoTaxonomyVisitor seems to populate key values only. -

edit: this was almost fixed in v15.5.0 version, but there were some corner cases where only key was added and translation was missing.
Attached code as a potential fix. see also attached project which demonstrates the problem, in:
taxbug/site/webapp/src/main/java/org/onehippo/taxonomy/restapi/content folder you can find:

expected_output.json (
v15_output.json (default output of v15.0 version)
HippoTaxonomyVisitor.java (patched version of HippoTaxonomyVisitor)
patch_output.json ( or visit http://localhost:8080/site/taxonomies/documents after running attached project)