Bootstrap5 compatible close buttons

[michael-schindler]

First: The whole package works great with bootstrap5 as well. Thanks for this module! Anyways, I discovered a minor issue:

The close buttons do not work properly with bootstrap5 if I use the example provided. Instead of using the button attributes data-dismiss="modal", I had to use data-bs-dismiss="modal". Also, you can use the class .btn-close instead of using <span aria-hidden="true">&times;</span> as content.

Hope this helps. If not, please ignore.