Tutorial groups: Localize the import warning dialog's dismiss button

The button carried a literal "Ok" and so stayed English in a German
session. Reuse entity.action.close, which is already translated and names
what the button does to an informational dialog.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: az108

src/main/webapp/app/tutorialgroup/manage/tutorial-groups-management/tutorial-groups-import-button/tutorial-groups-import-button.component.html

@@ -26,6 +26,8 @@
 >
     <p jhiTranslate="artemisApp.tutorialGroupImportDialog.finishedWarning"></p>
     <ng-template #footer>
-        <button tumUiButton size="small" severity="secondary" type="button" (click)="closeWarningDialog()">Ok</button>
+        <button tumUiButton size="small" severity="secondary" type="button" (click)="closeWarningDialog()">
+            <span jhiTranslate="entity.action.close"></span>
+        </button>
     </ng-template>
 </p-dialog>