Fixed #31854 -- Fixed wrapping of long model names in admin's sidebar.

django/contrib/admin/static/admin/css/nav_sidebar.css

@@ -71,6 +71,7 @@
 
 #nav-sidebar .module th {
     width: 100%;
+    overflow-wrap: anywhere;
 }
 
 #nav-sidebar .module th,

docs/releases/3.1.1.txt

@@ -11,3 +11,6 @@ Bugfixes
 
 * Fixed wrapping of translated action labels in the admin's navigation sidebar
   for East Asian languages (:ticket:`31853`).
+
+* Fixed wrapping of long model names in the admin's navigation sidebar
+  (:ticket:`31854`).