Problem: The client reported an issue where the interface language was a mix of English and Dutch, despite Dutch being the original content language. They also mentioned that the 'Update existing translations' button was disabled with a message indicating no changes were made for an update. Additionally, the client had set a custom WP_LANG_DIR in their wp-config.php without having WordPress core language packs installed in that folder, which caused get_available_languages() to return empty, affecting the user profile language settings. Solution: We recommended checking if there was any custom code or plugin affecting the administration language settings. For resolving the interface language mix, the client successfully installed the nl_NL core language pack into the specified folder and adjusted the user profile language settings to English, ensuring the interface language became consistently English while keeping Dutch as the default content language. For further details on setting the WordPress administration language, visit Setting the WordPress Administration Language.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please do not hesitate to open a new support ticket at WPML support forum.
