remove unused switch language buttons

src/components/Header/Header.js

@@ -2,7 +2,6 @@ import React, { Component } from 'react';
 import PropTypes from 'prop-types';
 import { Link, withRouter } from 'react-router-dom';
 import { Dropdown } from 'react-viewerbase';
-import i18n from '@ohif/i18n';
 import { withTranslation } from 'react-i18next';
 import './Header.css';
 import OHIFLogo from '../OHIFLogo/OHIFLogo.js';
@@ -43,21 +42,13 @@ class Header extends Component {
       {
         title: t('About'),
         icon: {
-          name: 'info'
+          name: 'info',
         },
         link: 'http://ohif.org',
       },
     ];
   }
 
-  changeLanguage(language) {
-    i18n.init({
-      fallbackLng: language.substring(0, 2),
-      lng: language,
-    });
-    this.loadOptions();
-  }
-
   render() {
     const { t } = this.props;
     return (
@@ -89,30 +80,6 @@ class Header extends Component {
 
         <div className="header-menu">
           <span className="research-use">{t('INVESTIGATIONAL USE ONLY')}</span>
-          <button
-            className="research-use"
-            onClick={() => this.changeLanguage('en-US')}
-          >
-            EN-US
-          </button>
-          <button
-            className="research-use"
-            onClick={() => this.changeLanguage('en-UK')}
-          >
-            EN-UK
-          </button>
-          <button
-            className="research-use"
-            onClick={() => this.changeLanguage('es-AR')}
-          >
-            ES-AR
-          </button>
-          <button
-            className="research-use"
-            onClick={() => this.changeLanguage('es-MX')}
-          >
-            ES-MX
-          </button>
           <Dropdown title={t('Options')} list={this.options} align="right" />
           <ConnectedUserPreferencesModal />
         </div>