move various angular bits into shared jslib

src/angular/pipes/i18n.pipe.ts

@@ -0,0 +1,17 @@
+import {
+    Pipe,
+    PipeTransform,
+} from '@angular/core';
+
+import { I18nService } from '../../abstractions/i18n.service';
+
+@Pipe({
+    name: 'i18n',
+})
+export class I18nPipe implements PipeTransform {
+    constructor(private i18nService: I18nService) { }
+
+    transform(id: string, p1?: string, p2?: string, p3?: string): string {
+        return this.i18nService.t(id, p1, p2, p3);
+    }
+}