When you have multilanguage status module active the modals are not correctly displayed because the admin status bar as a higher z-index.
That z-index is putted there by mod_multilangstatus.
This PR removes that forced z-index.
Testing Instructions
Use latest staging with admin multilanguage status module enabled
Try to do a batch (in article for instance) or any other operation that results in a modal
Check the admin status bar is not darkened like the rest of the page
Apply the patch
Do step 2 again, you will see now the admin status bar it's darkened like the rest of the page
Please notice that this only solves the z-index problems with the status bar. The tooltips not appearing in batch modals are another issue related to mod_multilanguage but not related to z-index.
I have tested this item successfully on 8b93dc2
This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/9958.