l10n: zh_CN: for git v2.8.0 l10n round 3

Update 1 new translations (2530t0f0u) for git v2.8.0-rc2.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>

po/zh_CN.po

@@ -135,8 +135,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Git\n"
 "Report-Msgid-Bugs-To: Git Mailing List <git@vger.kernel.org>\n"
-"POT-Creation-Date: 2016-03-12 22:05+0800\n"
-"PO-Revision-Date: 2016-03-16 00:02+0800\n"
+"POT-Creation-Date: 2016-03-16 00:16+0800\n"
+"PO-Revision-Date: 2016-03-16 00:18+0800\n"
 "Last-Translator: Jiang Xin <worldhello.net@gmail.com>\n"
 "Language-Team: GitHub <https://github.com/jiangxin/git/>\n"
 "Language: zh_CN\n"
@@ -2442,6 +2442,10 @@ msgstr "丢失"
 msgid "behind "
 msgstr "落后 "
 
+#: wt-status.c:1680 wt-status.c:1683
+msgid "ahead "
+msgstr "领先 "
+
 #: compat/precompose_utf8.c:57 builtin/clone.c:413
 #, c-format
 msgid "failed to unlink '%s'"