PIM-2950: Replace buttons by icons
PIM-2950: Update less file to make icons clickables
PIM-2950: Change variables name and method to hide/show icons
PIM-2950: Clean code using href
PIM-2950: Update behat scenarios
PIM-2950: Update CHANGELOG.md
Merge pull request #1356 from akeneo/PIM-2950

PIM-2950: Harmonize view buttons