French (and European) typo/character
When translating in French, apostrophe character is not supported (not saved).
It is not UTF8 related, but most certainly has something to do with PHP. Since this problem could be extended too other kind of forms (not necessarily translation, but address registration also, it could involve mysql too) php related : http://ca.php.net/manual/en/function.addslashes.php mysql related (in this case, do not use addslashes) : http://www.php.net/manual/en/function.mysql-real-escape-string.php
"your account is not active" -> translated as : "votre compte n'est pas actif" -> saved as : "votre compte nest pas actif"
For now, I have to translate/save as "votre compte n.est pas actif"