[balsa] Fix Chinese (Simplified) translation of default:mm

[Piotr Drąg <piotrdrag src gnome org>]

commit 682c57d2cd20deb868ffff4930e57a8bfd21f14c
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Sep 26 16:00:42 2015 +0200

    Fix Chinese (Simplified) translation of default:mm

 po/zh_CN.po |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/po/zh_CN.po b/po/zh_CN.po
index 9365384..9eb68d3 100644
--- a/po/zh_CN.po
+++ b/po/zh_CN.po
@@ -6321,7 +6321,7 @@ msgstr "无法打印第 %d 页，因为文档只有 %d 页。"
 #.
 #: ../src/print-gtk.c:380
 msgid "default:mm"
-msgstr "默认:毫米"
+msgstr "default:mm"
 
 #: ../src/print-gtk.c:437
 msgid "inch"