Use the same header present in the Polish language files to
resolve the following warning in the de.po build:
[MSGFMT] de.mo
de.po:7: warning: header field 'Language' missing in header
Signed-off-by: Nathan Scott <nathans@debian.org>
"PO-Revision-Date: 2009-10-21 21:08+0100\n"
"Last-Translator: Chris Leick <c.leick@vollbio.de>\n"
"Language-Team: German <debian-l10n-german@lists.debian.org>\n"
+"Language: de\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"