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Hi there!
1) Please disable all the plugins except WPML and see if you can't still save the changes. do the same with a default theme instead of your current theme (which seems to be a custom theme?)
if you can, then try to enable the theme or plugins in small batches and test each time until you find the problematic plugin/theme.
2) Enable the debug.log to see if there are errors that could help us understand how to continue.
Try to recreate the problem once you have added those lines to your wp-config.php file and then go to your installation's wp-content folder and find the "debug.log" file that should've appeared by now (it will appear if it enocunters an error in your server).
Then, upload that file into a storage platform of your choosing (Google Drive, Dropbox, etc) and send me the link (make sure it's set as "public" otherwise i won't be able to access its content) so i can download it and take a look at it, and determine where to go from there.
This ticket is now closed. If you're a WPML client and need related help, please open a new support ticket.