sulu: French translation and title that does not appear in the administration

Hello,

I am developing a small site with Sulu, a Symfony CMS.

In first, I would like to understand why the titles of my fields do not display while I am well in the file homepage.xml :

`<?xml version="1.0" ?> <template xmlns="http://schemas.sulu.io/template/template" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://schemas.sulu.io/template/template http://schemas.sulu.io/template/template-1.0.xsd">

<key>homepage</key>

<view>pages/homepage</view>
<controller>Sulu\Bundle\WebsiteBundle\Controller\DefaultController::indexAction</controller>
<cacheLifetime>86400</cacheLifetime>

<meta>
    <title lang="fr">Accueil</title>
</meta>

<properties>
    <property name="title" type="text_line" mandatory="true">
        <meta>
            <title lang="fr">Titre</title>
        </meta>
        <params>
            <param name="headline" value="true"/>
        </params>

        <tag name="sulu.rlp.part"/>
    </property>

    <property name="url" type="resource_locator" mandatory="true">
        <meta>
            <title lang="fr">Lien de la page</title>
        </meta>

        <tag name="sulu.rlp"/>
    </property>

    <property name="article" type="text_editor">
        <meta>
            <title lang="fr">Description</title>
        </meta>
    </property>

    <property name="adresse_france" type="text_line">
        <meta>
            <title lang="fr">Adresse France</title>
        </meta>
    </property>

    <property name="adresse_madagascar" type="text_line">
        <meta>
            <title lang="fr">Adresse Madagascar</title>
        </meta>
    </property>

    <property name="email" type="email">
        <meta>
            <title lang="fr">E-Mail</title>
        </meta>
    </property>

    <property name="phone" type="phone">
        <meta>
            <title lang="fr">Phone number</title>
        </meta>
    </property>
</properties>

</template>`

In a second time, I used this version of Sulu: https://github.com/sulu/sulu

I unfortunately can not put the administration in French, I would like to know if it was possible to add a translation file for my administration.

Thank you in advance for your answers.