Add text that tells the players exactly why the total points are wrong

src/app/components/add-game/add-game.component.html

@@ -43,8 +43,8 @@
 					<td><input type="number" [(ngModel)]="this.actualPlayers[3].finalCardScore"/></td>
 				</tr>
 			</table>
-			<p id="score-warn" *ngIf="!totalScoreValid()">Total score doesn't add up!</p>
-			<button (click)="switchToNextPage()" [disabled]="!totalScoreValid()">Next</button>
+			<p id="score-warn" *ngIf="calculatePointSum() !== 240">Total score doesn't add up ({{getScoreDifferenceText()}})</p>
+			<button (click)="switchToNextPage()" [disabled]="!calculatePointSum()">Next</button>
 		</div>
 		<div id="which-solo" class="visible-{{this.currentPage === 4}}">