Quick fix, set default board name.

src/app/boards/boards.component.html

@@ -1,7 +1,7 @@
 <div class="wrappe">
 <img src="http://static.vdk2ch.ru:15555/test-public/16657431265390.png" alt="свiня" width="150">
 <app-send-post></app-send-post>,
-  <h2>/postgres/</h2>
+  <h2> {{boardName}} </h2>
 <button (click)="refreshPosts('postgres')">Общий раздел</button>
 <post-single
   *ngFor="let post of postsToShow" [post]="post"