Fixes several bugs, and helps with WRE optimizations.

Changelog:

 - prevent HTML and Macro injection in usernames
 - Fixed a problem that caused all Cron job parameters to return an empty hash
   ref.
 - fixed: creating new ad spaces is broken
 - don't write .wgaccess files for public uploads, allowing WRE optimizations
 - More i18n for Gallery templates
 - fix: Add an Album button now appears on Gallery List Albums view for those
   authorized.
 - fixed: Rich editor page and image pickers are broken