This problem was reported when a customer upgraded RA from 6.1 to 6.5.
RA has translation files to convert from tag to label. Filename is en-us.json.
When installation or upgrade, it is possible that some translation files are lost or not upgraded.
There are some en-us.json files under <RA Management Server>/webapps/datamanagement/i18n folder.
Despite timestamp and file size are same as working servers, the contents were different.
Please contact CA Support to get correct en-us.json file for your using release.
After replace these files, ROC will work fine.