Also translates the first arg if it's a symbol and adds more btn- classes if given as html_options[:type]

Just in case some translation keys are not present things should still work and make sense.
So translation keys should be picked in a meaningful way and scoped rather than prefixed.
For example overview.account will turn into "Account" if no translation is present while "overview_account" will turn into "Overview Account". We usually want the former.

FlashResponder added a flash before responding. However at the point of responding objects have already been saved. So there is no way to test if they were changed.

Now instead we can call
  flash_for resource
before
  resource.save

and it will add the flash messages only if the resource was actually changed.

close and open actions for plain opening and closing the tickets
respond_with so fields are not cleared on invalid update

the custom actions are not strictly restful. But adding a subresource felt like too much overhead and is conceptually hard to grasp (so we destroy the openess of the ticket to close it?).