Christian, thanks for the idea. Do you have some specific case in mind, which makes it bad for you to be shown always the same messages? Maybe some especially "boring" messages in some message group you monitor? Because of course you're going to see again only the messages you decide not to translate/review, no?
Oh no specific example in mind but ... better : could it be a Yes/No option for the person who translates or rereads: yes I want a random order,or no I prefer to follow the original flow of messages to reinforce the coherence of the translation for groups of messages.