chapter08/perl: missed space between Chinese and <userinput>

zh_CN/chapter08/perl.po

@@ -164,7 +164,7 @@ msgid ""
 "This ensures that <userinput>less</userinput> is used instead of "
 "<userinput>more</userinput>."
 msgstr ""
-"这保证该软件包使用<userinput>less</userinput> 对输出进行分页，而不是使用 "
+"这保证该软件包使用 <userinput>less</userinput> 对输出进行分页，而不是使用 "
 "<userinput>more</userinput>。"
 
 #. type: Content of: <sect1><sect2><variablelist><varlistentry><term>