Force set Accept-Language to English
to not deal with other number formats like 12 345,67 (ru) vs 12,345.67 (en)
Simplify parser: try convert any available data to number
Use faster way to get data from fxexchangerate.com
Add -preferFXExchangeRate argument
Force don't cache data from fxexchangerate.com
Refactor: add (and use) information about missing currencies on each server