updated composer to work with Releases Candidates repositories
required RC releases for devs
added a callback called when the list is started end another one when the list is stopped
Merge branch 'master' into rc
forced popover editor to use always the data-title attribute as title
fixed to accept all catalouges
fetched the translator from the container and assigned to a protected variable
added caption label to save button for translation
added translation
refactored button_widget adding the cms_language for translations
updated unit test
updated base test to fetch the translator