add Pennsylvania Dutch to languages

src/i18n/languages.js

@@ -22,6 +22,7 @@ const languages = [
   'nl',
   'oc',
   'pl',
+  'pdc',
   'pt',
   'ro',
   'ru',

src/i18n/service_worker_messages.js

@@ -25,6 +25,7 @@ const messages = {
   oc: require('../lib/notification-i18n-loader.js!./oc.json'),
   pl: require('../lib/notification-i18n-loader.js!./pl.json'),
   pt: require('../lib/notification-i18n-loader.js!./pt.json'),
+  pdc: require('../lib/notification-i18n-loader.js!./pdc.json'),
   ro: require('../lib/notification-i18n-loader.js!./ro.json'),
   ru: require('../lib/notification-i18n-loader.js!./ru.json'),
   sk: require('../lib/notification-i18n-loader.js!./sk.json'),

src/services/locale/locale.service.js

@@ -3,6 +3,7 @@ import ISO6391 from 'iso-639-1'
 import _ from 'lodash'
 
 const specialLanguageCodes = {
+  pdc: 'en',
   ja_easy: 'ja',
   zh_Hant: 'zh-HANT',
   zh: 'zh-Hans'
@@ -18,6 +19,7 @@ const internalToBackendLocaleMulti = codes => {
 
 const getLanguageName = (code) => {
   const specialLanguageNames = {
+    pdc: 'Pennsylvania Dutch',
     ja_easy: 'やさしいにほんご',
     'nan-TW': '臺語（閩南語）',
     zh: '简体中文',