(issue #3969) add action to search form
(issue #3969) add action to search form

required in iOS 8 to trigger the special Search keyboard (i.e. with Search instead of Return as the label for the Enter key)

nicolaasmatthijs/3akai-ux,Orodan/3akai-ux,jfederico/3akai-ux,Orodan/3akai-ux-jitsi-fork,mrvisser/3akai-ux,nicolaasmatthijs/3akai-ux,mrvisser/3akai-ux,simong/3akai-ux,mrvisser/3akai-ux,jfederico/3akai-ux,stuartf/3akai-ux,timdegroote/3akai-ux,Orodan/3akai-ux-jitsi-fork,timdegroote/3akai-ux,jfederico/3akai-ux,Orodan/3akai-ux,Orodan/3akai-ux,simong/3akai-ux,stuartf/3akai-ux,simong/3akai-ux,timdegroote/3akai-ux,Orodan/3akai-ux-jitsi-fork,stuartf/3akai-ux,nicolaasmatthijs/3akai-ux