move country name lookup to library

src/components/registration/steps.jsx

@@ -466,7 +466,7 @@ class DemographicsStep extends React.Component {
     // look up country code from country label ('United States' -> 'us')
     // if `countryName` is not found, including if it's null or undefined, then this function will return undefined.
     getCountryCode (countryName) {
-        const country = countryData.countryInfo.find(countryItem => countryItem.name === countryName);
+        const country = countryData.lookupCountryName(countryName);
         return country && country.code;
     }
     handleValidSubmit (formData) {

src/lib/country-data.js

@@ -1040,6 +1040,10 @@ module.exports.lookupCountryInfo = countryCode => (
     countryInfo.find(country => country.code === countryCode)
 );
 
+module.exports.lookupCountryName = countryName => (
+    countryInfo.find(country => country.name === countryName)
+);
+
 /**
  * Function dupeCommonCountries():
  * takes startingCountryInfo, and duplicates any number of its country labels