Can the language (language__v) field be set to multi-select in Vault?
The language__v field is not multi-select because there are features that are built around it being a single-value field (such as merge fields).
The document needs to be able to interpret a system user change and what language the output should be in. A different field should be used if the language needs to be tracked for a different purpose.
Vault Document Fields Documentation: Managing Document Fields
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