Improved and fixed image block
This patch improves and fixes the image block. Here's the changes:
- BlockManagerImage inherits from BlockManagerRequest to handle the image link path
- Fixed link_class form parameter
- When any link is added, the default value has been changed from # to empty value. When this happens the link tag is not rendered
- Changed position for some editor fields
- Translated missing valus
- Added behat test for image block
- Added "The element < element > should [not] exist in the DOM" to behat features
improved and fixed behat tests