About translation Django's Rest API through decorators

Hey. I don't understand the logic of a method i had to use around my Rest Api translation messages. I had used gettext on all messages i needed on my project. And in some parts i needed to use decorator method, like this :

@method_decorator(

reponse_toast_decorator(Toast(message=gettext("Votre nouveau document a été créé.")), data_field_name="document"),

name="create",

)

@method_decorator(

reponse_toast_decorator(Toast(message=gettext("Le document a bien été mis à jour.")), data_field_name="document"),

name="update",

)

@method_decorator(reponse_toast_decorator(Toast(message=gettext("Le document a bien été supprimé."))), name="destroy")

class DocumentViewSet(viewsets.ModelViewSet):

I've generate po and mo with german translation. All worked fine except messages passed trough decorator method, which wasn't translated in language of user's browser. So translation went about settings of project(Language_code). To fix that, i had to use gettext in addition of my class properties called on my decorator. Like this : 

class Toast:

def __init__(self, message, titre="", delai=2000, statut="succes", langue="", erreur=""):

self.message = message

self.statut = statut

self.titre = titre

self.langue = langue

self.erreur = erreur

self.delai = delai

@property

def data(self):

cur_langue = get_language()

self.langue = cur_langue[0:2].upper() # Formatage pour le Front

return {

"statut": self.statut,

"message": gettext(self.message),

"titre": self.titre,

"langue": self.langue,

"erreur": self.erreur,

"delai": self.delai,

}

def reponse_toast_decorator(toast=None, data_field_name=""):

"""Décorateur permettant de modifier la response d'une vue"""

"""Afin de conserver le réglage de langue de l'utilisateur

renvoyé dans la requête, il est nécessaire de transmettre cette requète à la classe Toast.

"""

def decorator(func):

@wraps(func)

def wrapper(*args, **kwargs):

# language = request.LANGUAGE_CODE

# print(language)

# Toast.request = request

# print(Toast.request)

response = func(*args, **kwargs)

# print(response)

if not isinstance(toast, Toast):

raise ValueError("L'argument 'toast' doit être une instance de la classe Toast")

if isinstance(response, Response):

if response.status_code == status.HTTP_204_NO_CONTENT:

response.status_code = status.HTTP_200_OK

if response.data is None:

response.data = {}

if not data_field_name:

response.data.update({"toast": toast.data})

return response

response.data = {data_field_name: response.data, "toast": toast.data}

return response

return wrapper

return decorator

So i don't understand why i need to write this way to make translation work about user language. Could someone explain me please ?

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