Monolingual text isn't yet showing up when performing data extension of Commons files via the Commons Reconciliation Service in OpenRefine.

You can test with this small dataset:

(all audio files that are pronunciation audio, found via this query)

• Load this set in OpenRefine
• Reconcile the file names using the Commons Reconciliation Service
• Try to retrieve the values of the Audio Transcription (P9533) property - currently this will produce an empty column.

For inspiration: the Wikidata reconciliation service returns the string(s) without language code.