Some fixes on comments

Fix #205 

See merge request !161

Correcting comment typo in file header

Fix #190 

See merge request !144

Update, fix and add breton translation to correct branch



See merge request !143

Install framadate in non empty database

Modifications pour l'issue #187.

See merge request !139

Added escaping for install in config.tpl

In the installation process, string like the one below should be a valid application name (or DB password).
> Framadate c'est vraiment super ! "Datez" comme vous voulez \o/

It missed some escaping for single quote (') and backslash (\\), resulting in PHP parse errors.

It should be cherry-picked to the `release` branch too.

See merge request !136

    - Ajout d'un editeur de markdown
    - On garde le formattage des espaces
    - On empeche l'utilisateur de mettre du html