Update security.md
Merge pull request #12 from Nicolab/develop

Update security.md
Merge pull request #13 from caouecs/develop

Traduction & typo
Update testing.md
Update testing.md
Update validation.md

Fix et traduction
Update validation.md
Update security.md
Merge pull request #14 from Nicolab/develop

Typos
Merge pull request #4 from laravel-france/develop

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