Added support for French, Chinese (Mandarin, simplified), and Norweigan. Updated German and Spanish translations

- Updated README to reflect new official translator
- XLIFFs to come later

src/app/settings/locales_list.ts

@@ -190,7 +190,7 @@ export const isoLangs = {
    },
    'fr': {
        'name': 'French',
-       'nativeName': 'français, langue française'
+       'nativeName': 'français'
    },
    'ff': {
        'name': 'Fula; Fulah; Pulaar; Pular',

src/app/settings/settings.component.ts

@@ -17,7 +17,7 @@ import { ConfirmDialogComponent } from 'app/dialogs/confirm-dialog/confirm-dialo
 })
 export class SettingsComponent implements OnInit {
   all_locales = isoLangs;
-  supported_locales = ['en', 'es', 'de'];
+  supported_locales = ['en', 'es', 'de', 'fr', 'zh', 'nb'];
   initialLocale = localStorage.getItem('locale');
 
   initial_config = null;