Plural resource label form fix

Same that was with Index pages and was fixed in:
https://github.com/gregbell/active_admin/pull/2135
Added ukrainian locale
Merge pull request #2255 from mindhalt/patch-1

Fix plural resource label for default :destroy batch action
fix breadcrumb code for non-ID primary keys

+ `display_name` returns nil if the object passed isn't truthy
+ updated the `parts.pop` line to be more representative
+ the remaining regular expression is more accurate
move filter translation into SearchMethodSelect

+ it's now much easier to add new query methods
+ `_equals` is now an accepted search method for strings
update translations
change translations to use metasearch terminology
Merge pull request #2231 from Daxter/refactor/filters/translations

move filter translation into SearchMethodSelect
prevent N+1 queries for Comments index page
fix broken JS for filter form

Something changed the form's ID to go from 'q' to 'new_q'.
That's fine; this is a better solution anyway.