filters frontend improvements
Merge pull request #2458 from juherpin/master

filters frontend improvements
 style improvements for treeview
Merge pull request #2464 from juherpin/ui-fix

Style improvements for treeview
Added missing slovak translations
Added missing czech translations
also log previous exception message when available
Updated stylesheets and javascripts configuration
Removed old unused default configuration option parent:text from sonata_type_model_list, refs #2455
Disable unused checkbox in media tree view when no batch and no export
update ro and ru translations with latest keys
Merge pull request #2480 from xaben/update-translations

Update ro and ru translations for latest keys
ui improvements for ajax layout and filters
Merge pull request #2474 from PHDA/checkbox_media_tree

Disable unused checkbox in media tree view when no batch and no export
Merge pull request #2481 from juherpin/ftr-ui-list-table

UI improvements for ajax layout and filters