Update currency rates fails
The API forex-python uses for fetching currency rates no longer works:
https://github.com/MicroPyramid/forex-python/issues/86
Also it does not look like forex-python is being mantained.
Some users report CurrencyConverter (https://pypi.org/project/CurrencyConverter/) to be working correctly but it relies in some files being downloaded: https://github.com/alexprengere/currencyconverter/blob/master/currency_converter/currency_converter.py#L41
Maybe our best bet is to use another API such as https://exchangerate.host/