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The pictures are in French, but the ingame messages too?
Yes.
The text is also French. And I didn't see any way to switch the language to English.

After searching around the Internet a bit, I found a forum thread by the translator which confirms that the link I provided is for the last publicly released English demo, which would be version 8.5:
http://forums.tigsource.com/index.php?topic=4740.0

Notice in the screenshots that not only is the text in English, but so are the words in the title screen which is a picture.