PHPMailer/PHPMailer — pull request #178 by pchaigno (2014-02-01 22:00:31+00:00)
Title: Minor improvements of French translations.

The first one (empty_message) is correct but it sounds weird.
Same thing with "Erreur de fichier" in file_open.
The third one (file_open) is a common conjugation error.
The last one is grammatically correct but we do not say that (sentences without subject are rarely used in French).