sanitize item labels to not include line breaks
some items currently in the db have line breaks in their label
field. this should be sanitized when ingesting imho.
example:
curl https://sshoc-marketplace-api.acdh-dev.oeaw.ac.at/api/workflows/PzNK6A | jq '.label'
"Encode and modelize field surveys for their online\n dissemination"