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It would require a change in calibre to do what you want, unless you use a custom column with a computed value and set that as the shelf column in place of 'language'. I think the calibre user guide has good directions on how to set the value of a custom column based on the value of another column. If no one else posts the link for you (or if you don't find it) I'll take a look for it when I get a chance.
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