Nice game, finished it with no walkthrough...until an English walkthrough is
available, a (French) walkthrough with pictures for this game may be found here. :
http://www.nemopolis.net/uploads/solutions/BM_LesTablesDecryptees.pdf
Along with Online translation from "Promt Translator". :
http://www.online-translator.com/Default.aspx?prmtlang=en