add korean to i18n

src/app/app.module.ts

@@ -182,6 +182,7 @@ import localeEt from '@angular/common/locales/et';
 import localeFr from '@angular/common/locales/fr';
 import localeIt from '@angular/common/locales/it';
 import localeJa from '@angular/common/locales/ja';
+import localeKo from '@angular/common/locales/ko';
 import localeNb from '@angular/common/locales/nb';
 import localeNl from '@angular/common/locales/nl';
 import localePl from '@angular/common/locales/pl';
@@ -204,6 +205,7 @@ registerLocaleData(localeEt, 'et');
 registerLocaleData(localeFr, 'fr');
 registerLocaleData(localeIt, 'it');
 registerLocaleData(localeJa, 'ja');
+registerLocaleData(localeJa, 'ko');
 registerLocaleData(localeNb, 'nb');
 registerLocaleData(localeNl, 'nl');
 registerLocaleData(localePl, 'pl');

src/services/i18n.service.ts

@@ -11,8 +11,8 @@ export class I18nService extends BaseI18nService {
         });
 
         this.supportedTranslationLocales = [
-            'en', 'ca', 'cs', 'da', 'de', 'en-GB', 'es', 'et', 'fr', 'it', 'ja', 'nb', 'nl', 'pl', 'pt-PT', 'pt-BR',
-            'ru', 'sk', 'sv', 'uk', 'zh-CN', 'zh-TW',
+            'en', 'ca', 'cs', 'da', 'de', 'en-GB', 'es', 'et', 'fr', 'it', 'ja', 'ko', 'nb', 'nl', 'pl',
+            'pt-PT', 'pt-BR', 'ru', 'sk', 'sv', 'uk', 'zh-CN', 'zh-TW',
         ];
     }
 }