use proper currency symbol

[talkncloud]

Is your feature request related to a problem? Please describe.
Users can choose the currency from a list of currencies, not all currencies use $. the client should display the correct currency.

Describe the solution you'd like
show the correct currency e.g. USD = $, EUR = €

Describe alternatives you've considered
Just using $, this might be confusing for people using EUR

[talkncloud]

symbol is now available in the response (dev):

{
    "system": {
        "version": "0.0.7",
        "currencySymbol": "$"
    }
}