Add global I18n notation while we're external

frontend/angular.json

@@ -13,6 +13,7 @@
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
             "preserveSymlinks": true,
+            "aot": true,
             "outputPath": "../public/assets/frontend/",
             "index": "src/index2.html",
             "main": "src/main.ts",

frontend/legacy/typings/open-project-legacy.typings.d.ts

@@ -34,6 +34,7 @@
 import * as TAngular from 'angular';
 import * as TLodash from 'lodash';
 import {State} from "reactivestates";
+import {GlobalI18n} from "../../src/app/modules/common/i18n/i18n.service";
 
 export interface IPluginContext {
   classes:any;
@@ -52,4 +53,5 @@ declare global {
   }
   const angular:typeof TAngular;
   const _:typeof TLodash;
+  const I18n:GlobalI18n;
 }