[d-feet] Add Language headers to po files

[Piotr Drąg <piotrdrag src gnome org>]

commit 0795ec71a570c8b98c42863e715a488f0a7bbf0e
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Fri Jul 15 18:50:33 2016 +0200

    Add Language headers to po files
    
    Future versions of gettext will fail if this header is missing.

 po/sl.po       |    2 +-
 po/sr latin po |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/po/sl.po b/po/sl.po
index 1c93228..8a8b579 100644
--- a/po/sl.po
+++ b/po/sl.po
@@ -13,7 +13,7 @@ msgstr ""
 "PO-Revision-Date: 2014-08-06 14:43+0100\n"
 "Last-Translator: Matej Urbančič <mateju svn gnome org>\n"
 "Language-Team: Slovenščina <gnome-si googlegroups com>\n"
-"Language: sl_SI\n"
+"Language: sl\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
diff --git a/po/sr latin po b/po/sr latin po
index c664931..08d5154 100644
--- a/po/sr latin po
+++ b/po/sr latin po
@@ -11,7 +11,7 @@ msgstr ""
 "PO-Revision-Date: 2014-07-22 10:40+0200\n"
 "Last-Translator: Miroslav Nikolić <miroslavnikolic rocketmail com>\n"
 "Language-Team: Serbian <gnom prevod org>\n"
-"Language: sr\n"
+"Language: sr@latin\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"