Rosetta can be configured via the following parameters, to be defined in your project settings file:

  • ROSETTA_MESSAGES_PER_PAGE: Number of messages to display per page. Defaults to 10.
  • ROSETTA_ENABLE_TRANSLATION_SUGGESTIONS: Enable AJAX translation suggestions. Defaults to False.
  • YANDEX_TRANSLATE_KEY: Translation suggestions from Yandex Yandex.Translate API. To use this service you must first obtain an AppID key, then specify the key here. Defaults to None.
  • AZURE_CLIENT_ID and AZURE_CLIENT_SECRET: Translation suggestions using the Microsoft Azure API. To use this service, you must first register for the service, then specify the ‘Customer ID’ and ‘Primary Account Key’ respectively, which you can find on your account information page on Azure Marketplace.
  • ROSETTA_MESSAGES_SOURCE_LANGUAGE_CODE and ROSETTA_MESSAGES_SOURCE_LANGUAGE_NAME: Change these if the source language in your PO files isn’t English. Default to 'en' and 'English' respectively.
  • ROSETTA_WSGI_AUTO_RELOAD and ROSETTA_UWSGI_AUTO_RELOAD: When running WSGI daemon mode, using mod_wsgi 2.0c5 or later, this setting controls whether the contents of the gettext catalog files should be automatically reloaded by the WSGI processes each time they are modified. For performance reasons, this setting should be disabled in production environments. Default to False.
  • ROSETTA_EXCLUDED_APPLICATIONS: Exclude applications defined in this list from being translated. Defaults to ().
  • ROSETTA_REQUIRES_AUTH: Require authentication for all Rosetta views. Defaults to True.
  • ROSETTA_POFILE_WRAP_WIDTH: Sets the line-length of the edited PO file. Set this to 0 to mimic makemessage‘s --no-wrap option. Defaults to 78.
  • ROSETTA_STORAGE_CLASS: See the note below on Storages. Defaults to
  • ROSETTA_ACCESS_CONTROL_FUNCTION: An alternative function that determines if a given user can access the translation views. This function receives a user as its argument, and returns a boolean specifying whether the passed user is allowed to use Rosetta or not.
  • ROSETTA_LANGUAGE_GROUPS: Set to True to enable language-specific groups, which can be used to give different translators access to different languages. Instead of creating a global translators group, create individual per-language groups, e.g. translators-de, translators-fr, and assign users to these.
  • ROSETTA_CACHE_NAME: When using, you can store the Rosetta data in a specific cache. This is particularly useful when your default cache is a django.core.cache.backends.dummy.DummyCache (which happens on pre-production environments). If unset, it will default to rosetta if a cache with this name exists, or default if not.
  • ROSETTA_POFILENAMES: Defines which po file names are exposed in the web interface. Defaults to ('django.po', 'djangojs.po')
  • ROSETTA_EXCLUDED_PATHS: Exclude paths defined in this list from being searched (usually ends with “locale”). Defaults to ()
  • ROSETTA_AUTO_COMPILE: Determines whether the MO file is automatically compiled when the PO file is saved. Defaults to True.
  • ROSETTA_ENABLE_REFLANG: Enables a selector for picking a reference language other than English. Defaults to False.
  • ROSETTA_SHOW_AT_ADMIN_PANEL: Adds a handy link to Rosetta at the bottom of the Django admin apps index. Defaults to False.


To prevent re-reading and parsing the PO file catalogs over and over again, Rosetta stores them in a volatile location. This can be either the HTTP session or the Django cache.

Django 1.4 has introduced a signed cookie session backend, which stores the whole content of the session in an encrypted cookie. Unfortunately this doesn’t work with large PO files, as the limit of 4096 chars that can be stored in a cookie is easily exceeded.

In this case the Cache-based backend should be used (by setting ROSETTA_STORAGE_CLASS = ''). Please make sure that a proper CACHES backend is configured in your Django settings if your Django app is being served in a multi-process environment, or the different server processes, serving subsequent requests, won’t find the storage data left by previous requests.

Alternatively you can switch back to using the Session based storage by setting ROSETTA_STORAGE_CLASS = '' in your settings. This is perfectly safe on Django 1.3. On Django 1.4 or higher make sure you have DON’T use the signed_cookies SESSION_BACKEND with this Rosetta storage backend or funky things might happen.

TL;DR: if you run Django with gunincorn, mod-wsgi or other multi-process environment, the Django-default CACHES LocMemCache backend won’t suffice: use memcache instead, or you will run into issues.