Fix resurrect keywords in explore page

[Fix #49913179]
Added test for seeing keywords on explore page
JS translation for media_resource_arcs.
JS translations for media_resources.
Translation more or less complete now.
Fixing syntax error in search results that caused 500 on search.
Adapt test to new language.
Fix internal AR/Arel/rails bug by using class method for scope

This fixes the numbers in the grouppermission of the filterpanel.
There is yet a (similar?) bug that messes up the pagination.
Fix removing nodes when chaining queries with scope by stringify where clause
Reverted to scope definition for ordered_by of media_resource
Removed unused assignment in filter module