l10n: Updated Chinese (China) (zh_CN) translation to 100%

New status: 80 messages complete with 0 fuzzies and 0 untranslated.

Transmitted-via: Transifex (translations.xfce.org).

po-doc/zh_CN.po

@@ -16,6 +16,7 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=1; plural=0;\n"
 
 #. When image changes, this message will be marked fuzzy or untranslated for you.
 #. It doesn't matter what you translate it to: it's not used at all.