Improve display of crypto currencies when selected as the 'Current Conversion'

ui/app/components/balance-component.js

@@ -5,6 +5,7 @@ const inherits = require('util').inherits
 const TokenBalance = require('./token-balance')
 const Identicon = require('./identicon')
 const currencyFormatter = require('currency-formatter')
+const currencies = require('currency-formatter/currencies');
 
 const { formatBalance, generateBalanceObject } = require('../util')
 
@@ -98,9 +99,13 @@ BalanceComponent.prototype.renderFiatAmount = function (fiatDisplayNumber, fiatS
   const shouldNotRenderFiat = fiatDisplayNumber === 'N/A' || Number(fiatDisplayNumber) === 0
   if (shouldNotRenderFiat) return null
 
-  const display = currencyFormatter.format(Number(fiatDisplayNumber), {
-    code: fiatSuffix.toUpperCase(),
-  })
+  const upperCaseFiatSuffix = fiatSuffix.toUpperCase()
+
+  const display = currencies.find(currency => currency.code === upperCaseFiatSuffix)
+    ? currencyFormatter.format(Number(fiatDisplayNumber), {
+      code: upperCaseFiatSuffix,
+    })
+    : `${fiatPrefix}${fiatDisplayNumber} ${upperCaseFiatSuffix}`
 
   return h('div.fiat-amount', {
     style: {},
@@ -122,5 +127,9 @@ BalanceComponent.prototype.getFiatDisplayNumber = function (formattedBalance, co
 
   const splitBalance = formattedBalance.split(' ')
 
-  return (Number(splitBalance[0]) * conversionRate).toFixed(2)
+  const convertedNumber = (Number(splitBalance[0]) * conversionRate)
+  const wholePart = Math.floor(convertedNumber)
+  const decimalPart = convertedNumber - wholePart
+
+  return wholePart + Number(decimalPart.toPrecision(2))
 }