fixed error due to translation

jdav_web/members/admin.py

@@ -838,7 +838,7 @@ class GroupAdmin(CommonAdminMixin, admin.ModelAdmin):
         right = workbook.add_format({'bold': True, 'align': 'right'})
         worksheet = workbook.add_worksheet()
         
-        worksheet.merge_range(0, 0, 0, 6, _(f"group overview JDAV {settings.SEKTION}"), title)
+        worksheet.merge_range(0, 0, 0, 6, f"Gruppenübersicht JDAV {settings.SEKTION}", title)
         row = 1
         worksheet.write(row, 0, "Gruppe", bold)
         worksheet.write(row, 1, "Wochentag", bold)