Bleh

I think this is an issue of programmer-speak not translating well. If you have a better suggestion, you can find the relevant messages using Special:Allmessages ("parent" is used in a couple more places).

I think it's doubly lost in translation because I was assuming it was jargon and was assuming it was being used as a verb; i.e., "click here to parent this comment to another"... d'oh.