Merge r1878788 from trunk:

Merge r1878788 from trunk:

Try to fix once and for all, our "en" html file generation issues with different Java version.

Switch "en" doc files to UTF-8.

We should also change "en.xml" with:
   <target-ext>.html.en.utf8</target-ext>
and run:
   ./build.sh bootstrap
   ./build.sh
to be consistent with other languages.

Before making a lot of noise, first give some time to see how this works in RL.

[skip ci]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1880370 13f79535-47bb-0310-9956-ffa450edef68