Misc changes about form inputs.

frontend/src/app/components/submit-button/submit-button.component.html

@@ -1,8 +1,11 @@
-<button type="submit" [class]="color" [disabled]="disabled || requestPending" (click)="click.emit()">
+<button type="submit"
+        class="cod-button {{color}}"
+        [disabled]="disabled || requestPending"
+        (click)="click.emit()">
     @if (requestPending) {
         <mat-spinner class="spinner {{color}}" [diameter]="25"></mat-spinner>
     }
     <span>
-        {{ label }}
+        <ng-content/>
     </span>
 </button>