I have received a letter of recommendation which clearly has been written by my referee's assistant, rather than himself. That in itself wouldn't be a problem if it didn't contain phrases such as what's more... and like event study etc.
What should I do about this? Do I just forget about the reference? Do I very carefully suggest to the assistant to make some minor changes (this letter is based on a previous draft I was asked to submit)?
It may also be worth noting that the referee is the first supervisor for my thesis and I do not want to seem ungrateful by requesting changes to my letter of recommendation.
It seems to me that the use of the phrase what's more in a letter of recommendation is per se unacceptable, but my native language is German, so any comments by native speakers of English in this regard is appreciated.