Fix layout of comments submit button on all screen sizes
Fix layout of comments submit button on all screen sizes

* tested in IE10, IE11, Edge, Chrome and Firefox

michaelletzgus/nextcloud-server,xx621998xx/server,whitekiba/server,endsguy/server,jbicha/server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,nextcloud/server,endsguy/server,Ardinis/server,nextcloud/server,pixelipo/server,jbicha/server,endsguy/server,pmattern/server,xx621998xx/server,whitekiba/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,pixelipo/server,xx621998xx/server,pmattern/server,Ardinis/server,nextcloud/server,andreas-p/nextcloud-server,pixelipo/server,jbicha/server,Ardinis/server,pixelipo/server,jbicha/server,endsguy/server,whitekiba/server,michaelletzgus/nextcloud-server,jbicha/server,pixelipo/server,pmattern/server,pmattern/server,whitekiba/server,xx621998xx/server,michaelletzgus/nextcloud-server,xx621998xx/server,pmattern/server,endsguy/server,andreas-p/nextcloud-server,Ardinis/server,Ardinis/server,whitekiba/server