How to use the numeral.localeData function in numeral

import 'numeral/locales'

Logger.setLogLevel(IS_DEV ? Logger.LogLevels.DEBUG : Logger.LogLevels.ERROR) // eslint-disable-line no-undef

const getNavigatorLanguage = () => {
  if (navigator.languages && navigator.languages.length) {
    return navigator.languages[0]
  } else {
    return navigator.userLanguage || navigator.language || navigator.browserLanguage || 'en'
  }
}

const locale = getNavigatorLanguage().split('-')[0]
numeral.locale(locale)
try {
  numeral.localeData(locale)
} catch (e) {
  console.warn(`Couldn't find locale '${locale}', falling back to 'en'`)
  numeral.locale('en')
}

if (locale === 'de') {
  // overwrite locale format
  let de = numeral.localeData(locale)
  de.delimiters.thousands = '.'
}
moment.locale(locale)

const timezone = jstz.determine().name()
moment.tz.setDefault(timezone)

let model = new Start(locale)

return navigator.userLanguage || navigator.language || navigator.browserLanguage || 'en'
  }
}

const locale = getNavigatorLanguage().split('-')[0]
numeral.locale(locale)
try {
  numeral.localeData(locale)
} catch (e) {
  console.warn(`Couldn't find locale '${locale}', falling back to 'en'`)
  numeral.locale('en')
}

if (locale === 'de') {
  // overwrite locale format
  let de = numeral.localeData(locale)
  de.delimiters.thousands = '.'
}
moment.locale(locale)

const timezone = jstz.determine().name()
moment.tz.setDefault(timezone)

let model = new Start(locale)
model.render(document.body)

// but numeral locales are 8k compressed thus importing them all
            if (navigator.language){

                var locale = navigator.language.toLowerCase();

                numeral.locale(locale);

                // it might not exist as instead of "en-us"
                // numeral defines "en", live with this for now
                // change later to use navigators convention http://www.ietf.org/rfc/bcp/bcp47.txt
                if (!numeral.localeData()){
                    // try again with an abbreviated version
                    numeral.locale(locale.split( '-' )[0]);
                }

                if (!numeral.localeData()){
                    // set to english, browser might be set
                    // to a locale numeral does not have
                    numeral.locale("en-gb")
                }
            }
        },
        handleResize () {

function numberFormat(value, decimalPoints, decimalDelimiter, thousandsDelimiter) {
  // Temporarily update locale data (restore defaults after formatting)
  const locale = numeral.localeData();
  const savedDelimiters = locale.delimiters;

  // Mimic old behavior - AngularJS `number` filter defaults:
  // - `,` as thousands delimiter
  // - `.` as decimal delimiter
  // - three decimal points
  locale.delimiters = {
    thousands: ',',
    decimal: '.',
  };
  let formatString = '0,0.000';
  if (
    (Number.isFinite(decimalPoints) && (decimalPoints >= 0)) ||
    decimalDelimiter ||
    thousandsDelimiter
  ) {

format(amount, decimals = 0, currencyLocale = null) {
    const lang = currencyLocale || channel.request('currencyLocale');

    let formatStr = '$0,0';
    let currencyEnd = false;

    if (lang) {
      numeral.locale(lang);
      let language = numeral.localeData();

      if (language.format) {
        formatStr = language.format;
      }
    }

    if (formatStr.charAt(formatStr.length - 1) === '$') {
      currencyEnd = true;
      formatStr = formatStr.slice(0, -1);
    }

    for (let i = 0; i < decimals; i++) {
      if (i === 0) {
        formatStr += '.';
      }

public render() {
        numeral.localeData("en"); //
        const { className } = this.props;
        const value = numeral(this.props.value);
        const compactValue = this.stripTrailingZeros(value.format("0a.0"));
        const fullValue = value.format();
        const classes = numberFormattedClasses();

        const Tag = fullValue === compactValue ? `span` : `abbr`;
        return (
            
                {compactValue}
            
        );
    }

'use strict';
const Moment = require('moment');
const Json2Xml = require('json2xml');
const HandlebarsIntl = require('handlebars-intl');
const Helpers = require('handlebars-helpers');
const Numeral = require('numeral');
const _ = require('lodash');

_.assign(Numeral.localeData('en'), {
    abbreviations: {
        thousand: "K",
        million: "M",
        billion: "B",
        trillion: "T"
    }
});

const buildListOfWords = (words, separator) => {

    if (!Array.isArray(words)){
        return words;
    }
    if (words.length === 1){
        return words[0];
    }