Fixed code value in sonata_type_model_autocomplete_widget so it works with embedded admins
Fixed $property name in HelperController::retrieveAutocompleteItemsAction() (was $prop)
- minor change to exception message so apostrophe is not needed
- removed unused Controller reference from top of HelperController
Fixed some spanish translations.

- Fixed some typos and grammatical errors.
- Translated 'Dashboard' as 'Escritorio' just like Wordpress (Spanish translation) does.
- Translated 'link_actions' as 'Acciones'.
Merge pull request #2322 from sgomez/patch-1

Fixed some spanish translations.
Updated ModelAutocompleteType::buildForm() to use any attr options set for this widget
Removed span5 default class from attr option and updated tests
Use sonata_admin.admin.uniqid instead of sonata_admin.admin.root.uniqid
Fixed issue when multiple sub-admins were added in form building
Added test
Merge pull request #2303 from caponica/autocomplete_embed_fix

Fix to enable autocomplete in embedded Admins
Remove box shadow

![remove box shadow at sonata collection delete button](http://i5.minus.com/jb1vODTaDGKiPT.jpg)
Remove box shadow at sonata collection delete button
Merge pull request #2325 from Bladrak/fix_multiple_subforms

Fixed issue when multiple sub-admins were added in form building
Merge pull request #2327 from spolischook/patch-3

Remove box shadow
Fixed collections delete/add button styles
Merge pull request #2328 from spolischook/patch-4

Fixed collections delete/add button styles
Updates preview documentation

Changes:
- New accept/reject button design with glyphicons
- css that actually hides the form (fieldsets are no longer used)
Merge pull request #2329 from Green-Cat/patch-1

Updates preview documentation
Merge pull request #2320 from davidromani/master

Improve Catalan translation
Update SonataAdminBundle.pt_BR.xliff
Update SonataAdminBundle.pt_BR.xliff
Merge pull request #2331 from cassianotartari/patch-7

Update SonataAdminBundle.pt_BR.xliff
Merge pull request #2305 from caponica/autocomplete_attrs

Render attr values for sonata_type_model_autocomplete widgets