imporve catalan translation
Merge pull request #2337 from davidromani/master

Imporve catalan translation
Update SonataAdminBundle.bg.xliff

Add missing translations
Merge pull request #2343 from Warxcell/patch-2

Update SonataAdminBundle.bg.xliff
Revert "Update SonataAdminBundle.bg.xliff"
Merge pull request #2344 from sonata-project/revert-2343-patch-2

Revert "Update SonataAdminBundle.bg.xliff" - contains duplicate translation keys.
Improved ListMapper error handling.
Merge pull request #2345 from pulzarraider/listmapper_duplicate_exception_improved

Improved ListMapper error handling.
Refactored add_block.html.twig - fixed CS and bugs
Merge pull request #2346 from pulzarraider/add_block_fix

Refactored add_block.html.twig - fixed CS and bugs
Fixed wrong handling _per_page and _page datagrid parameters in php 5.3
Merge pull request #2348 from pulzarraider/per_page_fix

Fixed wrong handling with _per_page and _page datagrid parameters in php 5.3
Merge branch 'patch-8' of github.com:axzx/SonataAdminBundle into patch-8
alignment box .content-header and .alert in .content