Well, I think I'm the translator whose text you're reviewing, so my answer may not count, but here's my take: I suppose you could say that anyone who knows what a randomized study is will not be confused if the protocol title says "random study", but I prefer to be precise when talking about these things. In a reviewer role, I would certainly mark "ewekansige studie" as an error if I ever get it in a translation. There are times when the text lends itself to using the word "ewekansig", but in a protocol title I would not accept "ewekansig" for "randomised".