[CST-4880] Set 500 response status to internal server error page

src/app/core/services/server-response.service.ts

@@ -31,4 +31,8 @@ export class ServerResponseService {
   setNotFound(message = 'Not found'): this {
     return this.setStatus(404, message);
   }
+
+  setInternalServerError(message = 'Internal Server Error'): this {
+    return this.setStatus(500, message);
+  }
 }

src/app/page-internal-server-error/page-internal-server-error.component.ts

@@ -1,7 +1,8 @@
 import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { ServerResponseService } from '../core/services/server-response.service';
 
 /**
- * This component representing the `PageNotFound` DSpace page.
+ * This component representing the `PageInternalServer` DSpace page.
  */
 @Component({
   selector: 'ds-page-internal-server-error',
@@ -10,4 +11,13 @@ import { ChangeDetectionStrategy, Component } from '@angular/core';
   changeDetection: ChangeDetectionStrategy.Default
 })
 export class PageInternalServerErrorComponent {
+
+  /**
+   * Initialize instance variables
+   *
+   * @param {ServerResponseService} responseService
+   */
+  constructor(private responseService: ServerResponseService) {
+    this.responseService.setInternalServerError();
+  }
 }