Support for currency conversion

[gingerbeardman]

Describe the solution you'd like If selected text contains only numbers and currency, do currency conversion.

It makes sense to convert the language of money.

eg. ¥660, 660 yen, £9.99, $10.00, 10USD

Describe alternatives you've considered Using Chrome with Direct Currency Converter extension

Additional context Caching currency requests to once per day would be enough, then any currency API cn be used.

Currency API

• https://currencylayer.com/product (250 request per month)
• https://free.currencyconverterapi.com (100 requests per hour)

[uetchy]

It seems this is beyond the scope of Polyglot though, I'm curious to see how it turns out. Anyone who wants to make a PR for this feature?