this to show a "your thumbs/resizes are out of date" message whenever
we change the graphics rules. Tweak watermark module to add graphics
rules whenever we make a change, which triggers the graphics module to
add the permanent message.
Change admin/watermarks/upload -> admin/watermarks/add for consistency.
Internationalize position text, store it as text in the database,
display it to the admin.
Make i18n strings consistent to reduce l10n load.
1) they now have their own matching severity constants
2) they both have convenience functions success(), info(), warning() and error()
3) they both have severity_class()
their results, as opposed to having them return their view back
upstream. This is a little more code in every controller, but it's
much less magical and more consistent.
Look up the active_theme and active_admin_theme inside the view
itself, no need to do that in the controllers. This makes view
initialization easier in the controllers.
