Sophie commit to fix overwritten values
List editor validation passes through elements validation
Revert "Sophie commit to fix overwritten values"

This reverts commit 8b7fedeefc56ab12d420730bae482c1d4aaa965e.
WFA-2130: validation works well for targetings
WFA-2130: implement better management of errors - COMMITS IN BACKBONE_FORMS AND LIST
Merge commit '470491510f12b4a3d9c2104659469070ca84e663' into lboudard/WFA-2130/refactor_ads_backbone