apps/ListMapBox:add visually hidden h1 to project overview to comply with a11y fixes #3566
apps/ListMapBox:add visually hidden h1 to project overview to comply with a11y fixes #3566

liqd/a4-meinberlin,liqd/a4-meinberlin,liqd/a4-meinberlin,liqd/a4-meinberlin