Grouped picklist value is not translated into French when Document language is set to French



We created a group copy type, group by a picklist value, this picklist label has French translation values, however when user's language is set to French, the picklist always show English. 


I tried use Excel as middleware and custom metadata type to translate, it is working for non grouped type, but not working for grouped.


Is there a way to do this translation?


Thank you,

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