This is a Wordprss Functions.php snippet designed to set a WPML "default language" and redirect Groundhogg Managed pages based on that language.
add the code in functions.php to your funcitons.php (do not overwrite your functions.php)
Tested on Wordpress 5.6.1 with WPML 4.4.8 and Groundhogg 2.3.4.1
WPML cookie code modified from https://tombroucke.be/blog/wpml-remember-users-language-choice/