If attoFil price is >= 0.01 FIL, display as FIL instead

In the Offers box, we current display all prices in attoFil:

If the attoFil price is >= 10 000 000 000 000 000 attoFil, let's instead display the price like this 0.010 fil.

Use exactly 2 significant figures in the fil prices. Examples:

• 1e-16 attoFil would be displayed as 0.010 fil
• 12 133 333 333 333 333 attoFil would be displayed as 0.012 fil because of rounding)
• 12 533 333 333 333 333 attoFil would be displayed as 0.013 fil because of rounding)