These are historical languages which are already available for monolingual text.

gml (Middle Low German)

• Wikidata item: https://www.wikidata.org/wiki/Q505674
• Existing lexemes: https://www.wikidata.org/wiki/Special:WhatLinksHere/Q505674?namespace=146

peo (Old Persian)

• Wikidata item: https://www.wikidata.org/wiki/Q35225
• Existing lexemes: https://www.wikidata.org/wiki/Special:WhatLinksHere/Q35225?namespace=146

gmy (Mycenaean Greek)

• Wikidata item: https://www.wikidata.org/wiki/Q668366
• Existing lexemes: https://www.wikidata.org/wiki/Special:WhatLinksHere/Q668366?namespace=146

cop (Coptic)

• Wikidata item: https://www.wikidata.org/wiki/Q36155
• Existing lexemes: https://www.wikidata.org/wiki/Special:WhatLinksHere/Q36155?namespace=146