Cannot enable user_mailman_register list permissions if their names have special characters in mailman_manager module

If the list title in Mailman Manager module is "[MyList] - this is my list"; when any user group permissions for User_mailman_register module are being set to allow subscribing to this list, the error message below is returned:

An illegal choice has been detected. Please contact the site administrator.

Looking at watchdog logs gives the hint that the first "[" works ok, but the second "]" truncates the title while setting permissions, returning a "form" error.

Changing title to "MyList - this is my list" in mailman manager module fixes this.

I guess this problem can be submitted to the mailman manager module queue too, but it only causes problems with this module so I feel that the user_mailman_register module should do the necessary cleanup of the title to prevent this issue.

Thanks!