Hello Colin,
go for Page TSConfig: http://tinyurl.com/48s4v
here is an example to rename your columns, insert it into your PageTSconfig.
TCEFORM.tt_content.colPos {
altLabels.0 = Normal/Standard
altLabels.1 = my description 1
altLabels.2 = my description 2
altLabels.3 = my description 3
}
hth
Jan