cubicweb-bootstrap #5739348 form buttons are no longer themed [validation pending]

But appeared with cubicweb 3.21

priorityimportant
typebug
done in1.2.0
load0.500
load left0.000
closed by#954246855d3b [views] Fix button CSS class (closes #5739348)
patch[views] Fix button CSS class (closes #5739348) [applied]