there is that from the API patch notes:
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The $(language) substitution will be replaced with that two letter code. The new substitution $(officialLanguage) will always be “en” for custom languages, and the language code for official languages.
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meaning if a string isn't translated yet (like probably a lot of item names) the English version is in use.
what is your "itemID" exactly ? i dont find one in SHARED_INVENTORY except maybe uniqueID? but idk how this one works. If it's the name then the quote aboves explains the error