templates.generic.confirm: add btn class to submit button
templates.generic.confirm: add btn class to submit button

Turbo87/skylines,kerel-fs/skylines,skylines-project/skylines,dkm/skylines,kerel-fs/skylines,snip/skylines,RBE-Avionik/skylines,kerel-fs/skylines,TobiasLohner/SkyLines,Turbo87/skylines,Harry-R/skylines,Harry-R/skylines,TobiasLohner/SkyLines,skylines-project/skylines,dkm/skylines,skylines-project/skylines,Harry-R/skylines,dkm/skylines,RBE-Avionik/skylines,dkm/skylines,shadowoneau/skylines,Harry-R/skylines,snip/skylines,RBE-Avionik/skylines,skylines-project/skylines,shadowoneau/skylines,snip/skylines,TobiasLohner/SkyLines,shadowoneau/skylines,Turbo87/skylines,RBE-Avionik/skylines,shadowoneau/skylines,Turbo87/skylines