Compile translations for all languages in a single map, for Django.

i18n.py

from gettext import translation
import os.path

from django.conf import settings


def get_all_translations(domain):
    """Return a language code => translations mapping for all defined
    languages. This is useful if in a single view you need to use
    different translation catalogs at the same time.
    """

    allcat = {}

    paths = [os.path.join(settings.ROOT_DIR, app, 'locale') for
        app in settings.INSTALLED_APPS if
        os.path.exists(os.path.join(settings.ROOT_DIR, app, 'locale'))]

    paths.extend(reversed(settings.LOCALE_PATHS))

    for code, _ in settings.LANGUAGES:
        allcat[code] = {}
        for path in paths:
            try:
                t = translation(domain, path, [code])
                allcat[code].update(t._catalog)
            except IOError:
                pass
        if '' in allcat[code]:
            del allcat[code]['']
    return allcat