Add JS tests. Cleanup code and add github workflow to test.

src/locales/i18n.ts

@@ -0,0 +1,48 @@
+import i18n from 'i18next';
+import { initReactI18next } from 'react-i18next';
+import LanguageDetector from 'i18next-browser-languagedetector';
+import translations from './translations';
+
+const resources = {
+  ca: {
+    translation: translations.ca,
+  },
+  en: {
+    translation: translations.en,
+  },
+  es: {
+    translation: translations.es,
+  },
+  de: {
+    translation: translations.de,
+  },
+  fr: {
+    translation: translations.fr,
+  },
+  it: {
+    translation: translations.it,
+  },
+  no: {
+    translation: translations.no,
+  },
+  pl: {
+    translation: translations.pl,
+  },
+  tr: {
+    translation: translations.tr,
+  },
+};
+
+i18n
+  .use(LanguageDetector)
+  .use(initReactI18next)
+  .init({
+    resources,
+    fallbackLng: 'en',
+    debug: !!process.env.REACT_APP_I18N_DEBUG,
+    interpolation: {
+      escapeValue: false, // not needed for react as it escapes by default
+    },
+  });
+
+export default i18n;