Merge r1817175, r1831800 from trunk:

Merge r1817175, r1831800 from trunk:

Russian translations of errordocs.
Contributed by Alexander Gaganashvili.

Error page translations submitted for zh-cn and zh-tw, contributed
by CodeingBoy <codeingboy gmail.com>.

Note that zh-tw is not a native translation; each translation aught
be reviewed by a native reader before backporting to 2.4.x branch.

Submitted by: niq, wrowe
Reviewed by: jailletc36, covener, jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1834840 13f79535-47bb-0310-9956-ffa450edef68