Update standard_layout.html.twig

Check existence of admin_pool in some missing places.
 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
Don't show filters container when no one is active or visible
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
updated polish translations (added missing translations, fixes in grammar)
Merge pull request #2487 from jklab/master

updated polish translations
Merge pull request #2449 from costyoancea/patch-1

Added missing checks for admin_pool in standard_layout.html.twig
Merge pull request #2478 from juherpin/ftr-displayable-filters

Don't show filters container when no one is active or visible
add documentation and option to overwrite some templates