Add warning after copying templates

copy_admin_templates.py

@@ -27,11 +27,29 @@ def copyAdminTemplates():
 
     copytree(src, dist)
     print("Copied", src, "->", dist)
+
+    print(
+        f"""
+        _________
+        | WARNING
+        | -------
+        |
+        | You might have to edit the file {dist}/base.html by adding nav in the following way:
+        | This line:\t<ul class="navbar-nav mr-auto">
+        | Becomes:\t<ul class="nav navbar-nav mr-auto">
+        |
+        | This will prevent the navigation bar from expanding such that some elements can not be seen.
+        | Refer to this pull request: https://github.com/flask-admin/flask-admin/pull/2233
+        |
+        | If the above pull request is merged and flask-admin is on a new release after the merge,
+        | then this step is not needed.
+        _________
+        """
+    )
+
     return True
 
 
 if __name__ == "__main__":
-    if copyAdminTemplates():
-        print("Done!")
-    else:
+    if not copyAdminTemplates():
         print("Did not copy!")