Fix typo

Despite 'mutliple' being a pretty cool word.
Removed the special hack for 'Refinery Translator' role.

This adds complication to the core for a feature that could easily
be added by an extension when required.
Merge pull request #2730 from refinery/remove-translator-role

Removed the special hack for 'Refinery Translator' role.
Fixed bug: clicking Preview button causes Save button to open in a new browser window when clicked.
Instead of being configurable, made xhr_paging always enabled.

This option made no sense to be turned off because it makes for a better
user experience to prevent a full page reload when paging.
Now requiring only the jquery-ui JS that we use.
Merge pull request #2733 from refinery/enable-xhr-paging-by-default

Instead of being configurable, made xhr_paging always enabled.
Rectify changelog conflict.
Remove devise keys from locales
Remove authentication altogether.
Baby steps in removing authentication from refinery. (woohoo!)
Ensure that zilch is required wherever it is needed.
Don't rely on there being any menu items.
Mock things that we're not concerned with.

In these cases, we only care that the method in Refinery that is directly
responsible for allowing a controller returns false and that the active
plugins list is populated with the plugins that we expect to test our
assertions.
WIP make specs pass and flesh them out a bit.