Update "Copy URL" prompt text
Update "Copy URL" prompt text

Fixes #1088

maurizi/nyc-trees,azavea/nyc-trees,maurizi/nyc-trees,azavea/nyc-trees,kdeloach/nyc-trees,kdeloach/nyc-trees,maurizi/nyc-trees,kdeloach/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,kdeloach/nyc-trees,azavea/nyc-trees,maurizi/nyc-trees,azavea/nyc-trees