Fix #22, use ellipsis for overflowing text

admin/freeposte/admin/static/app.css

@@ -1,3 +1,10 @@
 .select2-search--inline .select2-search__field:focus {
   border: none;
 }
+
+.sidebar h4 {
+  padding-left: 5px;
+  padding-right: 5px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}