XenForo currently bundles intl-tel-input 12.1.15 (which seems to have been released sometime between september 2017 and june 2018) while the latest version 17.0.19 was released september 2022.
As 12.1.15 is lacking localization support (this was introduced in 12.4.0) it would be nice if this library could be updated.
Thank you for reporting this issue, it has now been resolved. We are aiming to include any changes that have been made in a future XF release (2.2.13).
