Imported Keywords from 2.4.8

We did just upgrade our server to OJS 3.1.2 and one of our editors has had problems with the keywords. On our old server the journals did separate keywords with “;”. On the new server the imported keywords seems to be separated with an “,”. That is OK, but they did allow the keywords to contain “,” for each article on the old server. So keywords from the old server “;thestrup, OJS, Journal; OMP;” are changed to “thestrup, OJS, Journal, OMP,”. Do we need to clean up in all the keywords for 200 articles manually or is there a manner to do this automatically?