how do you set descriptions for standard fields?

When creating an issue on your support site, there is information below "Environment" and "Description". e.g.:
"Please include a full description of how to replicate the problem you are experiencing. This may be the steps to replicate, or the data that caused the problem."
Where do I set that up on my system? I know it must be there, but I can't seem to find it. or is this hard-coded in a properties file somewhere, only?