Convert accrued interest from currency to USD or EUR

[desytech]

If an order becomes active we can derive the accrued interest.

Actual:

• push notifications displays the currency representation (BTC, ETH, ...)

Expected:

• display the accrued interest in some human readable format (USD, EUR)
• we can introduce a setting in the config that leads the application to one user preferred currency

I like the implementation of Coindesk, no additional API Key is needed:
https://api.coindesk.com/v1/bpi/currentprice.json

{"time":{"updated":"Dec 12, 2020 13:03:00 UTC","updatedISO":"2020-12-12T13:03:00+00:00","updateduk":"Dec 12, 2020 at 13:03 GMT"},"disclaimer":"This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchangerates.org","chartName":"Bitcoin","bpi":{"USD":{"code":"USD","symbol":"$","rate":"18,457.9816","description":"United States Dollar","rate_float":18457.9816},"GBP":{"code":"GBP","symbol":"£","rate":"13,956.3567","description":"British Pound Sterling","rate_float":13956.3567},"EUR":{"code":"EUR","symbol":"€","rate":"15,239.9248","description":"Euro","rate_float":15239.9248}}}

[desytech]

This Ticket gets relevant if we support lending of currencies like BTC. Kucoin API respond contains already the accrued interest in USDT for USDT lending.