Some renames in exchange states

`HandshakingExchange` is renamed as `DepositPendingExchange`, and
`NotStartedExchange` is renamed as `HandshakingExchange`. With these renames,
we consider that a exchange is handshaking upon creation. Also a exchange which
already have the deposits but is waiting for them to be confirmed receives a
more appropriate name.
Merge pull request #441 from sortega/fix_logging

Fix logging and a compilation problem in headless
Merge pull request #440 from apoloval/task/cf-174

Some renames in exchange states
Fix some typos and missing info in order submission form

* _By no more/less than_ should be _For no more/less than_
* A new line is added to indicate the maximum allowed fiat per order
Merge pull request #443 from apoloval/port/cf-182

[PORT] Fix some typos and missing info in order submission form