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Comply to validator.prestashop.com rules #18
This is a PR to comply with Modules validation standards (validator.prestashop.com).
Before the PR, there uses to be 4 errors, 18 warnings and 7 security issues.
I did not fix it all because the last errors/warnings do not seem relevant to me. This is mostly "line exceeds 120 characters" warnings that, if fixed, would decrease the code readability.