Merge pull request #2429 from juherpin/master

Frontend updates for media treeview
partial revert of 0f67eb74491e083b93bc7f3e3de4a3de4b9ca661
Merge pull request #2432 from juherpin/master

Treeview : allow to show some elements initially
remove commented lines
fix list mode with nested admin
fix filter jQuery selector for names with "."
Merge pull request #2434 from rakhnin/master

fix filter jQuery selector for names with "."
add support for mosaic mode in the modal list
fix missing references
update assets (some are now in the CoreBundle)
fix Select2 locale
Updated SonataAdminBundle.nl.xliff
Update hungarian translation
Update Admin.php

Fixed possible typo.
Merge pull request #2452 from NoScopie/patch-6

Update Admin.php
Merge pull request #2448 from TommyChris/patch-2

Update hungarian translation
Merge pull request #2442 from interstroom/master

Updated SonataAdminBundle.nl.xliff
filters frontend improvements