[openstreetmap-website] When exporting, embed attribution by default. (#408)

[RicoElectrico]

Some people are still not quite aware that when they use images exported from osm.org, they are obliged to put an attribution somewhere. When exporting an image, by default there should be attribution placed in the corner of the image, maybe even a logo, and a checkbox reading "I will place the attribution by myself" which would remove the attribution so it looks like currently.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/408
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