webapp: when showing videos, limit maximum width just like it is limited for showing pictures
webapp: when showing videos, limit maximum width just like it is limited for showing pictures

tscholl2/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,sagemathinc/smc,sagemathinc/smc,sagemathinc/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc