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Description of problem:

Error messages and some entries in GUI tools are not localized.

Version-Release number of selected component (if applicable):
graphviz-2.26.0-7.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. LANG=cs_CZ.utf8 dot -Tgtk /usr/share/graphviz/graphs/directed/tree.gv
2. LANG=cs_CZ.utf8 dot -Tpng nonexistent -o out.png
  
Actual results:
Gtk interface does not have all UI texts translated. Only standard menu entries and buttons like Open, Save, New, ... are translated. When called with non existent file it only outputs error in English.

Expected results:
Have everything translated and consistent.


Additional info:
Not a show breaker but it would be nice to have :)

AFAIK there is no translation in graphviz. What you can see is internal translation of "stock" items from GTK toolkit.

It would require graphviz to incorporate gettext and it is something that should be addressed upstream / rawhide. I wouldn't like to develop this exclusively for RHEL-6 and branch from upstream.