Added batch of Chinese localization of HTML about shellexe files.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@36625 71c3de6d-444a-0410-be80-ed276b4c234a

war/src/main/webapp/help/shell/shellexe_zh_CN.html

+<div>
+   通常你不需要填写此项,Hudson会帮你找到正确的shell执行文件.
+   如果你的<tt>sh</tt> (Windows) 或者 <tt>/bin/sh</tt>不在系统<tt>PATH</tt>里,
+   那么就指定一个shell执行文件的绝对路径.
+</div>
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