Add translator documentation.
Fixed a few inconsistencies in the process. Apparently this code has been copied to imsettings.php, and some cases of 'email' had not been changed to 'IM'. Added FIXME for using globals/macros (?) in messages like "%%site.name%%". For easier/more consistent translation, this should preferably be plain %s parameters.
Showing with 112 additions and 22 deletions