Hello,
If a certification with translation is scheduled, have the option during the exam to see the "original" question in English - in case there is any doubt about interpretation.
When making a new certification available, disclose the dates that it will be available in other languages in the description, or have a standard deadline, (for example, 1 month after publication for Japanese, 2 months for Portuguese and 3 months for Spanish...), or the best option: only make a new certification available when it is already available in all languages.
Thanks