Feature homonyms translations

Relative to issue #53 .
It seems an undifened behaviour. Check http://comments.gmane.org/gmane.comp.gnu.utils.bugs/15893 and [The context serves to disambiguate messages with the same untranslated-string. It is possible to have several entries with the same untranslated-string in a PO file, provided that they each have a different context. Note that an empty context string and an absent msgctxt line do not mean the same thing. ](http://www.gnu.org/software/gettext/manual/gettext.html#PO-Files)