951228 - Systems Custom Information - Keyname and value needs to
enforce maximum length restrictions

the maximum length restriction looks like it was being enforced, but there were no error
messages. The user should now get success/error messages on custom_info
creation/deletion/update.
Merge pull request #2529 from komidore64/fricken-length-validations-slash-notifications-and-stuff

951228 - Systems Custom Information - Keyname and value needs to enforce maximum length restrictions