[FIX] File galleries: Set encoding of AJAX reply on file uploads to UTF-8 to avoid miscoded display of response.  This affected MSIE 6 to 9 in French. Not sure why all other browsers seem to work magically.
[FIX] File galleries: Set encoding of AJAX reply on file uploads to UTF-8 to avoid miscoded display of response. 
This affected MSIE 6 to 9 in French. Not sure why all other browsers seem to work magically.

git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@39737 b456876b-0849-0410-b77d-98878d47e9d5

changi67/tiki,changi67/tiki,oregional/tiki,oregional/tiki,oregional/tiki,tikiorg/tiki,oregional/tiki,tikiorg/tiki,changi67/tiki,tikiorg/tiki,changi67/tiki,tikiorg/tiki,changi67/tiki