#2: add grunt i18n and server i18n

   Add grunt i18n.
   Change i18n translate to server.

Gruntfile.js

@@ -78,7 +78,36 @@ module.exports = function(grunt) {
           'frontend/**/*.pug'
         ]
       }
+    },
+
+    i18n_checker: {
+      all: {
+        options: {
+          baseDir: __dirname,
+          dirs: [{
+            localeDir: 'backend/lib/i18n/locales',
+            templateSrc: [
+              'frontend/app/**/*.pug'
+            ],
+            core: true
+          }],
+          verifyOptions: {
+            defaultLocale: 'en',
+            locales: ['en', 'fr', 'vi'],
+            rules: [
+              'all-keys-translated',
+              'all-locales-present',
+              'default-locale-translate',
+              'key-trimmed',
+              'no-duplicate-among-modules',
+              'no-duplicate-with-core',
+              'valid-json-file'
+            ]
+          }
+        }
+      }
     }
+
   });
 
   grunt.loadTasks('tasks');
@@ -97,9 +126,11 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-eslint');
   grunt.loadNpmTasks('grunt-wait-server');
   grunt.loadNpmTasks('grunt-puglint');
+  grunt.loadNpmTasks('grunt-i18n-checker');
 
   grunt.registerTask('pug-linter', 'Check the pug/jade files', ['puglint:all']);
-  grunt.registerTask('linters', 'Check code for lint', ['eslint:all', 'lint_pattern:all', 'lint_pattern:css', 'pug-linter']);
+  grunt.registerTask('linters', 'Check code for lint', ['eslint:all', 'lint_pattern:all', 'lint_pattern:css', 'pug-linter', 'i18n']);
+  grunt.registerTask('i18n', 'Check the translation files', ['i18n_checker']);
   grunt.registerTask('linters-dev', 'Check changed files for lint', ['prepare-quick-lint', 'eslint:quick', 'lint_pattern:quick']);
   grunt.registerTask('spawn-servers', 'spawn servers', ['shell:mongo', 'shell:redis']);
   grunt.registerTask('kill-servers', 'kill servers', ['shell:mongo:kill', 'shell:redis:kill']);

backend/lib/i18n/index.js

+'use strict';
+
+module.exports = function(dependencies) {
+  const i18n = dependencies('i18n');
+
+  i18n.setDefaultConfiguration({ directory: __dirname + '/locales' });
+
+  return i18n;
+};

backend/lib/i18n/locales/en.json

+{
+  "Seed module" : "Seed module",
+  "My sidebar" : "My sidebar"
+}

backend/lib/i18n/locales/fr.json

+{
+  "Seed module" :  "Le module seed",
+  "My sidebar" : "Ma barre latérale"
+}

backend/lib/i18n/locales/vi.json

+{
+  "Seed module" : "Seed module",
+  "My sidebar" : "My sidebar"
+}

backend/webserver/application.js

@@ -9,6 +9,7 @@ module.exports = function(dependencies) {
 
   // Every express new configuration are appended here.
   // This needs to be initialized before the body parser
+  require('./config/i18n')(dependencies, application);
   require('./config/views')(dependencies, application);
 
   return application;

backend/webserver/config/i18n.js

+'use strict';
+
+module.exports = function(dependencies, application) {
+  var i18n = require('../../lib/i18n')(dependencies);
+  application.use(i18n.init);
+};

frontend/app/home/seed-main.pug

@@ -2,4 +2,4 @@ sub-header
   seed-subheader
 .seed-main-content
   .seed-module-card
-    h1 {{ 'Seed module' | translate }}
+    h1 #{__('Seed module')}

frontend/app/home/seed-sidebar.pug

 .seed-sidebar-content
   .card-header
-    h1 {{ 'My sidebar' | translate }}
+    h1 #{__('My sidebar')}

frontend/app/home/seed-subheader.pug

@@ -3,6 +3,6 @@ extends /modules/subheader/responsive-subheader.pug
 block left
   seed-burger-button.hidden-md
   span.seed-subheader-content
-    | {{ 'Seed Module' | translate }}
+    | #{__('Seed module')}
 
 block right

index.js

@@ -13,7 +13,8 @@ const myAwesomeModule = new AwesomeModule(MODULE_NAME, {
     new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.logger', 'logger'),
     new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.webserver.wrapper', 'webserver-wrapper'),
     new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.db', 'db'),
-    new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.webserver.middleware.authorization', 'authorizationMW')
+    new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.webserver.middleware.authorization', 'authorizationMW'),
+    new Dependency(Dependency.TYPE_NAME, 'linagora.esn.core.i18n', 'i18n')
   ],
 
   states: {

package.json

@@ -17,6 +17,7 @@
     "grunt-contrib-jshint": "1.1.0",
     "grunt-contrib-watch": "1.0.0",
     "grunt-eslint": "19.0.0",
+    "grunt-i18n-checker": "linagora/grunt-i18n-checker#v2.0.0",
     "grunt-karma": "2.0.0",
     "grunt-lint-pattern": "linagora/grunt-lint-pattern#7c6f4e1bc98c2851fec2714e115ac33e1b064ca7",
     "grunt-mocha-cli": "3.0.0",
@@ -45,7 +46,8 @@
     "sinon-chai": "2.8.0",
     "socket.io": "1.2.1",
     "supertest": "2.0.0",
-    "time-grunt": "^1.4.0"
+    "time-grunt": "1.4.0",
+    "i18n-checker": "linagora/i18n-checker#v2.0.0"
   },
   "scripts": {
     "test": "grunt test",