The problem is not in your resource  file.
Because i use unicode & havn't any problem.
My resource file something like thie:

title=\u0627\u0637\u0644\u0627...
name=\u0639\u0646\u0648\u0627\u0646
letter_pre_code=\u0643\u062f
sequence_in_parent=\u0627\u0648\u0644\u0648\u064a\u062a
desc=\u0634\u0631\u062d

and it's work good.