po: Fix Language fields

Warned-by: i18nspector

man/po/de.po

@@ -11,7 +11,7 @@ msgstr ""
 "PO-Revision-Date: 2012-10-14 20:30+0200\n"
 "Last-Translator: Helge Kreutzmann <debian@helgefjell.de>\n"
 "Language-Team: de <debian-l10n-german@lists.debian.org>\n"
-"Language: \n"
+"Language: de\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=utf-8\n"
 "Content-Transfer-Encoding: 8bit\n"

man/po/hu.po

@@ -9,7 +9,7 @@ msgstr ""
 "PO-Revision-Date: 2012-09-29 02:54+0200\n"
 "Last-Translator: SZERVÁC Attila <sas@321.hu>\n"
 "Language-Team: Hungarian\n"
-"Language: \n"
+"Language: hu\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

man/po/ja.po

@@ -10,7 +10,7 @@ msgstr ""
 "PO-Revision-Date: 2012-09-29 02:55+0200\n"
 "Last-Translator: TAKAHASHI Motonobu <monyo@monyo.com>\n"
 "Language-Team: Debian Japanese List <debian-japanese@lists.debian.org>\n"
-"Language: \n"
+"Language: ja\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"

man/po/pt_BR.po

@@ -9,7 +9,7 @@ msgstr ""
 "PO-Revision-Date: 2012-09-29 02:55+0200\n"
 "Last-Translator: Andre Luis Lopes  <andrelop@debian.org>\n"
 "Language-Team: Portuguese <debian-l10n-portuguese@lists.debian.org>\n"
-"Language: pt\n"
+"Language: pt_BR\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"