Initial setup for adding Hindi to the editor.

client/components/Nav.jsx

@@ -679,6 +679,16 @@ class Nav extends React.PureComponent {
                 日本語
               </button>
             </li>
+            <li className="nav__dropdown-item">
+              <button
+                onFocus={this.handleFocusForLang}
+                onBlur={this.handleBlur}
+                value="hi"
+                onClick={(e) => this.handleLangSelection(e)}
+              >
+                हिन्दी
+              </button>
+            </li>
           </ul>
         </li>
       </React.Fragment>

client/i18n.js

@@ -1,16 +1,17 @@
 import i18n from 'i18next';
 import { initReactI18next } from 'react-i18next';
 import Backend from 'i18next-http-backend';
-import { enUS, es, ja } from 'date-fns/locale';
+import { enUS, es, ja, hi } from 'date-fns/locale';
 
 const fallbackLng = ['en-US'];
-const availableLanguages = ['en-US', 'es-419', 'ja'];
+const availableLanguages = ['en-US', 'es-419', 'ja', 'hi'];
 
 export function languageKeyToLabel(lang) {
   const languageMap = {
     'en-US': 'English',
     'es-419': 'Español',
-    ja: '日本語'
+    ja: '日本語',
+    hi: 'हिन्दी'
   };
   return languageMap[lang];
 }
@@ -19,7 +20,8 @@ export function languageKeyToDateLocale(lang) {
   const languageMap = {
     'en-US': enUS,
     'es-419': es,
-    ja
+    ja,
+    hi
   };
   return languageMap[lang];
 }