Make Account History more intuitive

[dcts]

Currently we show in the open orders the specified token in the "Amount" and "Filled quantity".

I think it would be more intuitive to always show the token1 e.g. (on the DEXTR/XRD pair):

• BUY orders: show DEXTR to buy
• SELL orders: show DEXTR to sell

Open orders are always LIMIT orders, as MARKER orders will never be "open".

This would involve:

• calculating the DEXTR filled by using the %filled metric in all cases where token2 was specified.
•  we should also rename "Amount" in "Quantity", as token1 is always refered to as "Quantity" (while token2 is referred to as "Total"). This will add consistency to the UI as the order input component also uses this terminology.

Currently if you have multiple limit orders and specified a few in DEXTR, and a few in XRD, it will look confusing, like here:

#accounthistory