Add FR translation file + give more time for sending process

Depending of the hosting, max_execution_time can be set too low for the whole sending process to be performed, or the webmaster might not have control over php.ini settings, or even don't want to set it unlimited globally for various reasons (server shared with other scripts, unsafe scripts, etc.)

Adding an unlimited execution time can givin enough time only when needed for the digest sending process, and makes it globally safer on a larger diversity of server and configurations.