add metadata header in the generated po file, otherwise gettext tools cannot...
Jérome Perrin authored
add metadata header in the generated po file, otherwise gettext tools cannot be used to manipulate the file

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21191 20353a03-c40f-0410-a6d1-a30d3c3de9de
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