Suppress --!> as a comment closing tag in browsers

 * By converting it to --¡>

 * Still dirty diffs, but the behavior is consistent with what the
   php+tidy combination gives us and should be covered up by selser.

 * Ex. semediawiki/Nästa_dagordning?oldid=27867

Bug: 58184
Change-Id: I99ff6b5058683f535f6fdc38d8e4edb5b43c6210
Merge "Suppress --!> as a comment closing tag in browsers"