Resolve "Failing imports at commons:get-languages(xs:string)"

Michelle Weidlingrequested to merge
275-failing-imports-at-commons-get-languages-xs-string into develop

Adds missing languages to commons:get-languages.

⚠ Note: Import for one document, 41n22, will still fail because this file is not well-formed.

Closes #275 (closed)

Edited by Michelle Weidling

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