Resolve "[Queue-2.0] Course code should be shown in courses overview"

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Closes #483 (closed)

src/main/resources/templates/edition/index.html

@@ -88,6 +88,7 @@
             <thead>
             <tr>
                 <th>Edition</th>
+                <th>Code</th>
                 <th>Teacher</th>
                 <th></th>
             </tr>
@@ -96,6 +97,7 @@
             <tr th:each="edition : ${editions}">
                 <td><a th:href="@{/edition/{id}(id=${edition.id})}"
                        th:text="|${edition.course.name} (${edition.name})|"></a></td>
+                <td th:text="${edition.course.code}"></td>
                 <td th:text="${#strings.listJoin(@roleDTOService.teacherNames(edition), ', ')}"></td>
                 <td class="fit">
                     <th:block th:unless="${@permissionService.canViewEdition(edition) || edition.isArchived }">