Yes it is possible to do Arts Award in another language and to have the evidence in that language. It is then the responsibility of the adviser to provide translations into English for the purpose of the moderation. All assessment reports should be in English as well. This applies to portfolios in braille or using British Sign Language as evidence methods as well.
The exception to this is Welsh as we have a welsh speaking moderator who can moderate portfolios and assessment report forms in Welsh. Please ensure you make clear when you make a booking that you require a welsh speaking moderator.