[تم الحل] Available on backorder - translation

Background of the issue:
I am trying to resolve a translation issue on my site الرابط المخفي using WPML. The problem occurs with the text displayed when a product is on backorder.

Symptoms:
When the product is in stock, the text displays correctly in all languages. However, when it is on order, the message 'Available on backorder' appears in every language.
الرابط المخفي

Questions:
How can I change the translation for the 'Available on backorder' message?