*: install_null_translations -> install_gettext_translations

[kwist-sgr]

Use install_gettext_translations instead of install_null_translations

[jsocol]

Why do we need to make this change?

[kwist-sgr]

Though the localization option is enabled by this string

'extensions': ['jinja2.ext.i18n']  # get_env function,

it is not actually run because of the string

e.install_null_translations()

Because of this we have to overrun this limitation by extra code.

from django.utils import translation
from jingo import env

...
# Install gettext translations (jingo)
if ('jinja2.ext.i18n' in env.extensions or
    'jinja2.ext.InternationalizationExtension' in env.extensions):
    env.install_gettext_translations(translation)

[jsocol]

OK, thanks for clarifying!