we have activated language metadata for our journals in ojs 184.108.40.206 installation.
We want to change this text field from quicksubmit and submission form for a select list. The reason is to store this metadata based on ISO639-2 codes.
Some specific repostories that collect us usinf OAI-PMH check that this metadata values match to this ISO.
We are not sure how to do this change, can you give us some advise?