german time representation by keeping the ordering right; see #3

src/main/resources/templates/sheet.html

@@ -14,7 +14,7 @@
 				</thead>
 				<tbody>
 					<tr th:each="s : ${list}">
-						<td><span th:text="${#temporals.format(s.slotDay, 'yyyy-MM-dd')}"></span></td>
+						<td th:data-sort="${#temporals.format(s.slotDay, 'yyyy-MM-dd')}"><span th:text="${#temporals.format(s.slotDay, 'dd.MM.yyyy')}"></span></td>
 						<td><a th:href="@{/lesson?slotId={id}(id=${s.pkSlot})}" class="btn btn-outline-secondary"> <span th:text="${s.abbreviation}" th:if="${s.abbreviation}"></span> <i
 								class="bi bi-pencil" th:if="${s.abbreviation == null || s.abbreviation.isBlank()}"></i>
 						</a></td>
@@ -48,10 +48,6 @@
 				/*<![CDATA[*/
 				$(document).ready(function() {
 					$("#table").DataTable({
-						"columnDefs" : [ {
-							"targets" : 0,
-							"type" : "date-eu"
-						} ],
 						"order" : [ [ 0, 'desc' ] ],
 						"language" : locale_de
 					});