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Some PO files contain so-called "context information" to let
translators know whether, for instance, "home" means the user
directory, a key on the keyboard or the beginning of a line. Such
context information always begins with the letter combination "_:".
The important thing is: These strings must not show up in the
translations. In other words: Do not translate or copy this stuff into
the "msgstr" part of the PO file. If you do, your whole file will not
work anymore.

-- 
Malcolm Parsons