Edit-summary at Template:l, Template:t, etc.
I'm sorry, I didn't realise it would break things. I can undo it if you prefer?
I don't think you need to undo it just yet; but I'd appreciate if you could post a message about it at WT:BP or WT:GP. (Naturally the end-result of such a discussion might be that the change gets reverted, but I think it's more likely that no one will really care one way or the other.)