Menu local actions integration

Bootstrap 3:

Bootstrap 5:

Bootstrap 3 had a btn-xs, whereas in Bootstrap 5 there is no smaller than btn-sm.

In templates/overrides/block/block--local-actions-block.html.twig, it was not possible to use the list pattern because "content" have cacheable metadata in the render array.

Also preprocess of menu local action taken and adapted from https://git.drupalcode.org/project/bootstrap/-/blob/8.x-3.x/src/Plugin/P...

Automatically closed - issue fixed for 2 weeks with no activity.