Loads of translators work freelance because it’s very easy to do from home, so yeah I’d not expect then to be standardised. I’ve received English and native language replies, but never both.
A retired small town newspaper guy once told me about the first time the publisher went on vacation and left him in charge (this would have been in the 80s). The publisher told him “Don’t call me unless the building burns down, and even then, don’t call me until the fire is out.” Good example of management setting vacation expectations.

Which is why the workers who do have the ability, whether through place within the hierarchy or company culture, should not squander it. In fact, they should recognize the OOO as an opportunity to model and normalize organizational or even industry-wide guardrails (as opposed to bullshit feebly-maintained ‘boundaries’). It’s why, starting this summer, we need to embrace the blunt, descriptive OOO message.
I saved this one for the last example. It’s exactly what anyone would like to say when an associate messages them regarding any work during the holiday season. It talks about the ‘me time’ and also shares empathy for the sender. Especially, asking the sender to order the Pepperoni Pizza after stating the date of return is a fab movie. One of the best ways to display empathy is being humorous as it doesn’t put the other person into pressure- it makes way for helping them take the situation lightly!