Changing the language setting

Go to your settings and change LANGUAGE_CODE:.

For example:

LANGUAGE_CODE = 'fr' # French
LANGUAGE_CODE = 'zh-hans' # Chinese (simplified)

This will customize certain things such validation messages and formatting of numbers. For more information, see the Django documentation on translation and localization.

Writing your app in multiple languages

You may want your own app to work in multiple languages. For example, let’s say you want to run the same experiment with English, French, and Chinese participants.

For this, you can use Django’s translation system.

A quick summary:

  • In your settings, change LANGUAGE_CODE, and restart the server. Examples:

    LANGUAGE_CODE = 'fr'
    LANGUAGE_CODE = 'zh-hans'
  • Create a folder locale in each app you are translating, e.g. public_goods/locale. (If you forget to create this folder, the translations will go into your root folder’s locale folder.)

  • At the top of your templates, add {% load i18n %}. Then use {% blocktrans trimmed %}...{% endblocktrans %}. There are some things you can’t use inside a blocktrans, such as variables containing dots (e.g. {{ Constants.foo }}), or tags (e.g. {% if %}). More info here.

  • If you have localizable strings in your Python code, use ugettext.

  • Use makemessages to create the .po files in your app’s locale folder. Examples:

    django-admin makemessages -l fr
    django-admin makemessages -l zh_Hans
  • Edit the .po file in Poedit

  • Run django-admin compilemessages to create .mo files next to your .po files. If it doesn’t work, try running the command inside the app folder containing the locale/ folder.

If you localize the files under _templates/global, you need to create a folder locale in the root of the project.