initial i18n messages for loading and error components

src/app/shared/error/error.component.ts

@@ -1,5 +1,9 @@
 import { Component, Input } from '@angular/core';
 
+import { TranslateService } from '@ngx-translate/core';
+
+import { Subscription } from 'rxjs/Subscription';
+
 @Component({
   selector: 'ds-error',
   styleUrls: ['./error.component.scss'],
@@ -9,4 +13,24 @@ export class ErrorComponent {
 
   @Input() message = 'Error...';
 
+  private subscription: Subscription;
+
+  constructor(private translate: TranslateService) {
+
+  }
+
+  ngOnInit() {
+    if (this.message === undefined) {
+      this.subscription = this.translate.get('error.default').subscribe((message: string) => {
+        this.message = message;
+      });
+    }
+  }
+
+  ngOnDestroy() {
+    if (this.subscription !== undefined) {
+      this.subscription.unsubscribe();
+    }
+  }
+
 }