Show human readable form of language codes
e.g. for "deu" and "eng" here: https://dev.textgridrep.org/search?filter=project.id%3ATGPR-f3e628ae-74b8-2ebb-9fee-614c59c9b522
e.g. for "deu" and "eng" here: https://dev.textgridrep.org/search?filter=project.id%3ATGPR-f3e628ae-74b8-2ebb-9fee-614c59c9b522