A Mayday call is a broadcast. You really can't expect to censor a broadcast. Not afterwards, anyway.
As for the Anglo-Saxon expletive at the end: it's not the first time that word has been transcribed from the final moments of a CVR or ATC recording and it certainly will happen again.
Please, let's not get pansy about the reality of what actually happens in fatalities. Please let's not bowdlerise reality, other than with a few indicative asterisks for the usual four letter words which almost invariably occur in such immediacies.
Please let's not confuse or blur reality with some kind of imagery of fragrant Ophelia floating down the Don covered with rose petals, instead of facing the bloody nasty reality of what has occurred.
There is a religious incantation thread elsewhere for that queazy stuff.