Is it possible to change language information of numerous items at once ?

I've received a huge Zotero collection (+1000 items) I have to clean up and organize.
Some metadatas are not harmonized, especially language informations : there are sometimes "en" or "English" or "Eng" (etc.) / "fr" "Fran├žais", and so on.
(I am not speaking about the local language or bibliographical language, but about the language information included in the "Info" pane for each item).

Is there a way to select several items and to change at once this specific information for all selected items ?
Thanks for your help.
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