[ADF-1356] Single configuration of i18n service per project (#2199)

* rework i18n layer init

* fix unit tests

* fix tests

* test fixes

* remove obsolete tests

demo-shell-ng2/app/app.component.ts

@@ -42,10 +42,6 @@ export class AppComponent {
                 private storage: StorageService,
                 private logService: LogService) {
         this.setProvider();
-
-        if (translateService) {
-            translateService.addTranslationFolder('app', 'resources');
-        }
     }
 
     isAPageWithHeaderBar(): boolean {

demo-shell-ng2/app/app.module.ts

@@ -23,7 +23,7 @@ import { DiagramsModule } from 'ng2-activiti-diagrams';
 import { ActivitiFormModule } from 'ng2-activiti-form';
 import { ActivitiProcessListModule } from 'ng2-activiti-processlist';
 import { ActivitiTaskListModule } from 'ng2-activiti-tasklist';
-import { AppConfigService, CoreModule } from 'ng2-alfresco-core';
+import { AppConfigService, CoreModule, TRANSLATION_PROVIDER } from 'ng2-alfresco-core';
 import { DataTableModule } from 'ng2-alfresco-datatable';
 import { DocumentListModule } from 'ng2-alfresco-documentlist';
 import { LoginModule } from 'ng2-alfresco-login';
@@ -128,7 +128,15 @@ if (process.env.ENV === 'production') {
         FormListDemoComponent
     ],
     providers: [
-        { provide: AppConfigService, useClass: DebugAppConfigService }
+        { provide: AppConfigService, useClass: DebugAppConfigService },
+        {
+            provide: TRANSLATION_PROVIDER,
+            multi: true,
+            useValue: {
+                name: 'app',
+                source: 'resources'
+            }
+        }
     ],
     bootstrap: [ AppComponent ],
     entryComponents: [