Fixed broken links to chinese versions of some modules. The chinese version contains untranslated copies of english documentation for random_index and realip modules. The result is the appearance of 'translation to chinese' link for this modules pointing to non-existing document. This files are removed. Also, broken links are generated for the chinese version of the "flv" module, but the translation exists, although not enabled for publication. Since contents of file looks like a valid translation, it is allowed to be published.

<!--
  Copyright (C) Igor Sysoev
  Copyright (C) Nginx, Inc.
  -->

<!ELEMENT  article      (section+) >
<!ATTLIST  article
           name         CDATA #REQUIRED
           link         CDATA #REQUIRED
           lang         CDATA #REQUIRED
           rev          CDATA #IMPLIED
           author       CDATA #IMPLIED
           editor       CDATA #IMPLIED
           translator   CDATA #IMPLIED
           toc          (yes | no) "yes"
>

<!ENTITY % content      SYSTEM  "content.dtd" >
          %content;