Italian translation

Add the italian translation for the October CMS
More translation strings.
Escape unescaped translations. Add trans() function during output for the Balloon and Widget Selector.
Throw ApplicationException when AJAX handler not found
Escape all the translated strings
Add getTwig controller method
Merge pull request #544 from Flynsarmy/getTwigMethod

Add getTwig controller method
Minor
Fix issue when searching an asset in CMS backend

On Windows, searching for a file return the paths with the "\" separator, and throws an error when selecting a file for editing.
Merge pull request #545 from marininicola/develop

Fix an issue when searching an asset in CMS backend