This bug report is a very legitimate report on a legitimate bug.
What happens is when the bow is supposed to break, the stack count for the bow gets -1. In the snapshot however the bow seems to bug and and you are left with a stack of zero BOWS, not a bow with 0 durability.
(If i am wrong well derp, but this seems to be the most logical explanation)
Crowdin indicates the correct message for Canadian English, so that means that I should get the correct message when the error is given. Can't test this anymore because the servers are back up, but I will make the request for the Australian English. (edit: made request for Australian English)
Same thing happens with [r=x.x]