URL: http://group.renault.com/
Browser / Version: Firefox 31.0
Operating System: Windows 7
Problem type: Looks like the website has a bug.
Site owner: No

Steps to Reproduce
Hi there :)

1. Navigate to: http://group.renault.com/
2. Clic on Burger-icon
3. See the first words at the top of the menu

Expected Behavior: Words should be in the same line.
Actual Behavior: Words are overflowed.

Sounds like a solution:

#nav--mobile .links--diverse {
    padding-left: 5px;
}
#nav--mobile .links--diverse div {
    margin-left: 7px;
}
#nav--mobile .links--diverse div.lang {
    border-left: 0;
    margin-left: 0;
}

In fact, this menu is the mobile menu. This menu appears because of a bad mobile/touch detection. (Firefox return TRUE to "touch" support)
Nice day!