Taken from Debian "13-fix-missing-language-field-in-po-files.patch"
--- locale/pt_BR.po.orig	2019-03-06 10:42:22 UTC
+++ locale/pt_BR.po
@@ -11,7 +11,7 @@ msgstr ""
 "PO-Revision-Date: 2010-06-09 11:13+0200\n"
 "Last-Translator: cg <cg@dvdisaster.org>\n"
 "Language-Team: Portuguese\n"
-"Language: \n"
+"Language: Portuguese\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"