Modal Title
You can add a title to be shown on top of the modal popup, by adding a title attribute to the {modal} tag:
{modal url="https://www.openstreetmap.org/export/embed.html?bbox=-4.581298828125001%2C48.94415123418794%2C13.765869140625002%2C54.95238569063361&layer=mapnik" title="That's my place!"}Modal with Title{/modal}
Modal Description
You can also place an additional description under the title, with a description attribute:
{modal url="https://www.openstreetmap.org/export/embed.html?bbox=-4.581298828125001%2C48.94415123418794%2C13.765869140625002%2C54.95238569063361&layer=mapnik" title="That's my place!" description="Here is where I live"}Modal with Title & Description{/modal}