Show trade volume for pair under pro orderbook

[smk762]

Closes #2382 and #2384

To test:

• Confirm pairs match values at https://defi-stats.komodo.earth/api/v3/gecko/tickers
• Confirm reverse pair shows same values
• Confirm segwit / non-segwit pairs show same values
• If pair not in list on API, or zero volume traded, volume text should not display
• Confirm values update on fiat settings change as expected.
• Confirm pro view combo box text changes as expected when changing currency via menubar

[kivqa]

@smk762 trade volume works only for USD currency. If I use any other currency volume is zero
e.g. GBP

[smk762]

@smk762 trade volume works only for USD currency. If I use any other currency volume is zero e.g. GBP

Should be fixed now

fiats.mp4

[kivqa]

Approved.
Trade volume displayed correctly for different pairs and its matching with API response.
Changing currency in the app now handled correctly for trading volume.
There is not translation but its better to fix in separate issues with other places without translation.