Please, How i can translate product's informations ( descriptions, short description, title,..) in a lot of languages ( anglais, french, germany, ...) without creating the product many times for each language: can I do that just with store view in Magento?
It is possible. You just need to create a store-view for your language. After that, you can configure product description, title ... for each store view by opening a product, select store view on top left ( "Choose Store View" ) and uncheck the checkbox Use Default Value on the right of each field.
Hope it's helpful for you.