update chinese translations
Merge pull request #2485 from scourgen/2.3

update chinese translations
Added missing exclamation mark that is displayed on tab with error
Merge pull request #2488 from pulzarraider/fix_missing_exclamation

Added missing exclamation mark that is displayed on tab with error
Update conditional_validation.rst

Since maxLength(), and minLength() are deprecated in symphony 2.3, the assertMinLength(), and assertMaxLength() would cause errors
Merge pull request #2515 from oopsFrogs/patch-2

Update conditional_validation.rst
Fixed wrong permission check in retrieveAutocompleteItemsAction in HelperController.
add the form-group class conditionally

The form-group does not seem to play well with horizontal forms.
Merge pull request #2518 from greg0ire/native_collections_horizontal_forms

add the form-group class conditionally
Revert "add the form-group class conditionally"
Merge pull request #2534 from sonata-project/revert-2518-native_collections_horizontal_forms

Revert "add the form-group class conditionally"
Implement html field type

Currently, there is no way to display safe html in a sonata list
Merge pull request #2553 from roukmoute/html_type

Implement html field type
[2.3][FR Translations] message_delete_confirmation

Same as #2574 but for 2.3 branch.
Merge pull request #2523 from pulzarraider/fix_autocomplete_granted

Fixed wrong permission check in retrieveAutocompleteItemsAction in HelperController
Update installation.rst
Merge pull request #2621 from JulienItard/patch-1

Update installation.rst
Replace getRootAlias with getRootAliases

getRootAlias is deprecated
Merge pull request #2624 from roukmoute/patch-2

Replace getRootAlias with getRootAliases
Update conditional_validation.rst

missing namespaces
    use Sonata\BlockBundle\Block\BaseBlockService;
    use Sonata\BlockBundle\Model\BlockInterface;
in sonata.page.cms.page service