When I tried to manually change the taxonomy tag labels and slugs from English to French.
E.g.: Tag to Étiqueter - After clicking the save the French translation is encoded with some extra characters to Étiqueter. I think this may be due to the tick available on the French (Étiqueter) word. I searched some WPML documents to override but couldn't find anything related to it.
Our dev team has identified that the problem is in our method WPML_Super_Globals_Validation::get_value, in wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-super-globals-validation.php.
We have a workaround solution for your website so that the issue is solved.
Please follow these steps:
1- Get access to your website files
2- Go to \WPML_Super_Globals_Validation::get_value in wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-super-globals-validation.php
3- change the following code:
I am happy to see your issue is fixed and thank you for sharing your solution with us, anyway as an issue it was escalated to the development team and it should be fixed in the future but for now, I cannot give you an exact time when the next update will be.