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[-] BO: Wrong multi-language features #2723
The easiest way to describe it like this: the front-office shows good values, back-office bad
 => array with values for id_lang = 1
Now when we have one language PrestaShop tried to get  but should get , it's because for some reason you try to get array value by key, I think this change prevents such a problem and make sure that array is always provided by correct language_id
After the change array looks like this:
of course in our case we could change $k to $k+1 but I think it's not the effective solution.
Let me know if you neeed more information about this problem.