Added i18n service to Ghost core

refs https://github.com/TryGhost/Ghost/issues/15502

- this adds the scaffolding for enabling i18n translations within Ghost
  core
- also adds `yarn translate:ghost` as an option to the `i18n` package
- the locale is currently hardcoded to `en` so we don't utilize the
  translations until we're ready

ghost/core/core/boot.js

@@ -102,6 +102,11 @@ async function initCore({ghostServer, config, bootLogger, frontend}) {
     await settings.syncEmailSettings(config.get('hostSettings:emailVerification:verified'));
     debug('End: settings');
 
+    debug('Begin: i18n');
+    const i18n = require('./server/services/i18n');
+    await i18n.init();
+    debug('End: i18n');
+
     // The URLService is a core part of Ghost, which depends on models.
     debug('Begin: Url Service');
     const urlService = require('./server/services/url');

ghost/core/core/server/services/i18n.js

@@ -0,0 +1,14 @@
+//const debug = require('@tryghost/debug')('i18n');
+const i18n = require('@tryghost/i18n');
+
+module.exports.init = function () {
+    //const events = require('../lib/common/events');
+    //const settingsCache = require('../../shared/settings-cache');
+
+    module.exports = i18n(/* settingsCache.get('locale') */ 'en', 'ghost');
+
+    /*events.on('settings.locale.edited', (model) => {
+        debug('locale changed, updating i18n to', model.get('value'));
+        i18nInstance.changeLanguage(model.get('value'));
+    });*/
+};

ghost/core/package.json

@@ -88,6 +88,7 @@
     "@tryghost/helpers": "1.1.76",
     "@tryghost/html-to-plaintext": "0.0.0",
     "@tryghost/http-cache-utils": "0.1.7",
+    "@tryghost/i18n": "0.0.0",
     "@tryghost/image-transform": "1.2.4",
     "@tryghost/importer-handler-content-files": "0.0.0",
     "@tryghost/importer-revue": "0.0.0",

ghost/i18n/lib/i18n.js

@@ -4,7 +4,7 @@ const SUPPORTED_LOCALES = ['en', 'nl'];
 
 /**
  * @param {string} [lng]
- * @param {'portal'|'test'} ns
+ * @param {'ghost'|'portal'|'test'} ns
  */
 module.exports = (lng = 'en', ns = 'portal') => {
     const i18nextInstance = i18next.createInstance();

ghost/i18n/locales/en/ghost.json

@@ -0,0 +1 @@
+{}

ghost/i18n/locales/nl/ghost.json

@@ -0,0 +1 @@
+{}

ghost/i18n/package.json

@@ -12,7 +12,8 @@
     "lint:code": "eslint *.js lib/ --ext .js --cache",
     "lint": "yarn lint:code && yarn lint:test",
     "lint:test": "eslint -c test/.eslintrc.js test/ --ext .js --cache",
-    "translate": "yarn translate:portal && yarn translate:test",
+    "translate": "yarn translate:ghost && yarn translate:portal && yarn translate:test",
+    "translate:ghost": "NAMESPACE=ghost i18next '../core/core/{frontend,server,shared}/**/*.{js,jsx}'",
     "translate:portal": "NAMESPACE=portal i18next '../portal/src/**/*.{js,jsx}'",
     "translate:test": "NAMESPACE=test i18next './test/**/*.js'"
   },