The language of aviation RT is English.
Yes Crash but with a full blown Paddy accent for some words, I hear the local ATC lady saying "QFE one zero one TRREEE" the first part with a Scottish accent, the "3" part like she's just got off the boat from Donegal. Interestingly they seemed to have dropped using "niner" for 9.
In the end it's all good with no confusion or problem being understood.