[Typo3] TemplaVoila and Localization

[Hervé Inisan]

Hi!

Using TemplaVoila 0.4.0 (Typo3 3.8.0), I'm trying to localize a website.
I have only a 'cosmetic' problem: 

Under the Page module / Localization tab is a "Switch to language" selector
box. And beside this combobox, a list of flags corresponding to my website
languages. But the default flag is not displayed (red cross). The others are
ok.

Is there a way to define the flag for my default language ?

TIA,
-- Hervé Inisan.