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django-rest-framework/docs/topics/internationalisation.md
Craig Blaszczyk 9f169acb62 capitalise Django
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Internationalisation

REST framework ships with translatable error messages. You can make these appear in your language enabling Django's standard translation mechanisms and by translating the messages into your language.

How to translate REST Framework errors

This guide assumes you are already familiar with how to translate a Django app. If you're not, start by reading Django's translation docs.

To translate REST framework error messages:

  1. Make a new folder where you want to store the translated errors. Add this path to your LOCALE_PATHS setting.

Note: For the rest of this document we will assume the path you created was /home/www/project/conf/locale/, and that you have updated your settings.py to include the setting:

LOCALE_PATHS = (
    '/home/www/project/conf/locale/',
)
  1. Now create a subfolder for the language you want to translate. The folder should be named using locale name notation. E.g. de, pt_BR, es_AR, etc.
mkdir /home/www/project/conf/locale/pt_BR/LC_MESSAGES
  1. Now copy the base translations file from the REST framework source code into your translations folder
cp /home/user/.virtualenvs/myproject/lib/python2.7/site-packages/rest_framework/locale/en_US/LC_MESSAGES/django.po
/home/www/project/conf/locale/pt_BR/LC_MESSAGES

This should create the file /home/www/project/conf/locale/pt_BR/LC_MESSAGES/django.po

Note: To find out where rest_framework is installed, run

python -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())"

  1. Edit /home/www/project/conf/locale/pt_BR/LC_MESSAGES/django.po and translate all the error messages.

  2. Run manage.py compilemessages -l pt_BR to make the translations available for Django to use. You should see a message

    processing file django.po in /home/www/project/conf/locale/pt_BR/LC_MESSAGES

  3. Restart your server.

How Django chooses which language to use

REST framework will use the same preferences to select which language to display as Django does. You can find more info in the Django docs on discovering language preferences. For reference, these are

  1. First, it looks for the language prefix in the requested URL
  2. Failing that, it looks for the LANGUAGE_SESSION_KEY key in the current user’s session.
  3. Failing that, it looks for a cookie
  4. Failing that, it looks at the Accept-Language HTTP header.
  5. Failing that, it uses the global LANGUAGE_CODE setting.

Note: You'll need to include the django.middleware.locale.LocaleMiddleware to enable any of the per-request language preferences.