I see. I think it might work with adding another column "Restrict Languages" to the table in "Sharing books by email" which would contain either popup-menus to check languages (but I hate those long menus that contain all possible languages on the planet), or a free text field that would be empty (no restriction), or contain a list of languages to send, e.g. "English, German". But maybe it could contain any search term that can be in the Search field on the library page, then it could be used for all possible selections and restrictions, not only by language...?
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