[CA-5466] Pouvoir surcharger les messages i18n par langue #307
      
        
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CA-5466
Dans un premier temps j'ai modifié l'implémentation i18n existante. (cf. premier commit)
Néanmoins c'est une implémentation custom et j'ai voulu voir si il était possible de remplacer cette implémentation maison par l'utilisation de la librairie i18next (et son extension react-i18next pour React).
Au final c'était pas trop compliqué à faire et ça marche bien donc je pousse avec cette feature.
Au final ça apporte aussi quelques features appréciables comme :