DB tables created with a collation different than the database collation
http://www.prestashop.com/forums/topic/363458-fresh-install-doesnt-prestashop-respect-the-existing-database-collation/
Solution: http://forge.prestashop.com/browse/PSCSX-3486
Tag: bug-fix
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Prestashop 1.6: enable collation_database for creating tables