BUild.PL :
        Add Locale::TextDomain package.

lib/Slic3r.pm
        using Locale::TextDomain package and add extract wrapper function '__u'

var/language/remove-potcdate.sed
var/language/remove-potcdate.sin
var/language/retrieve_gettext.sh
        from GNU gettext perl samles. 'retrieve_gettext.sh' is retrieving extructions
        and create/update slicr3.pot. And then format mo file from .po file.