It seems it look likes a bug.
(There is activity on the translation side those times).
The best is to signal it (open an issue) on https://github.com/bisq-network/bisq
for me the dispute message also is in spanish now. I already had several trades and couple of them had disputes. All other disputes had the english message, but this one right now had the spanish version.
Is there an explanation for this now?
None of my computer-/OS-/System-settings are setup in spanish
Some of the messages appear in Spanish for some reason, Im not sure why I double checked the language but still every now and then some keep popping up in Spanish