Move / Rename "Calculating Orders" text

There's three changes in this pull req, each can be individually reversed if we don't agree with them all:

Renaming "Calculating Order Totals In Satoshis" to "Pricing Orders"
(Seemed shorter and clearer to me)

Removing "Expiring Old Order Totals"
(This part is very short so this allows to save some space in the menu again)

Moving "Calculating Order Totals In Satoshis" near "Disbursing Income.."
(I thought it might actually be more relevant to start with "Requesting Payment" right away, and then go on with complex / real-life / non-protocol stuff. This part seemed relevant to the "Disbursing Income" text too).