How to fix i18n fallback , from variant xx-YY to xx and from xx to en the translatino is not available.

[Abdullah Sh.]

Well, official documentation says clearly it should fall-back (ex: fr-fr to fr then to en) but my case raises 404 error.

Source: https://django.readthedocs.io/en/1.5.x/topics/i18n/translation.html

If a base language is available but the sublanguage specified is not, Django uses the base language. For example, if a user specifies de-at (Austrian German) but Django only has de available, Django uses de.

...

LANGUAGES = ( ('de', _('German')), ('en', _('English')), )

This example restricts languages that are available for automatic selection to German and English (and any sublanguage, like de-ch or en-us).

Here are related code portions:




settings.py




# Language code for this installation. All choices can be found here:
# http://www.i18nguy.com/unicode/language-identifiers.html
LANGUAGE_CODE = 'en'

LANGUAGES = (
  ( 'ar', "Arabic" ),
  ( 'en', "English" ),
  ( 'fr', "French" ),
  ( 'id', "Indonesian" ),
  ( 'ja', "Japanese"),
  ( 'ku', "Kurdish" ),
  #( 'ur', "Urdu" ),
  ( 'ms', "Malay" ),
  ( 'ml', "Malayalam" ),
  #( 'tr', "Turkish" ),
  ( 'es', "Spanish" ),
  ( 'pt', "Portuguese"),
  #( 'sv', "swedish" )
)

# These are languages not supported by Django core. We have to provide
# their info here so we can use them in our templates. This is mainly
# used in `wui.templatetags.languages`.
EXTRA_LANGUAGES = {
  'ku': {
    'code': 'ku',
    'name': 'Kurdish',
    'bidi': True,
    'name_local': 'Kurdish'
  },
  'ms': {
    'code': 'ms',
    'name': 'Malay',
    'bidi': False,
    'name_local': 'Malay'
  },
}


SITE_ID = 1

# If you set this to False, Django will make some optimizations so as not
# to load the internationalization machinery.
USE_I18N = True

# If you set this to False, Django will not format dates, numbers and
# calendars according to the current locale
USE_L10N = True

urls.py




from django.conf.urls import patterns, include, url
from django.conf.urls.i18n import i18n_patterns

# Uncomment the next two lines to enable the admin:
# from django.contrib import admin
# admin.autodiscover()

urlpatterns = patterns( '',
  url( r'^jos2', 'wui.views.jos2' ),
  url(r'^r', 'wui.views.one_aya_page'),
  url(r'^$', 'wui.views.results'),
  # url( r'^admin/', include( admin.site.urls ) ),
)

# These URLs accept the language prefix.
urlpatterns += i18n_patterns('',
  url(r'^$', 'wui.views.results'),
  url(r'^(?P<unit>\w{3,15})/', 'wui.views.results'),
)

# 404 not found handler

handler404 = 'wui.views.custom_404'

[Abdullah Sh.]

 

Well as far I can test, Django i18n does supports fall-back 'xx-YY' to 'xx' then to default ('en' in my case) but only for 'Accept-Language' user agent header. It does not do same for URL language switch.

Here is the solution I could come up with:

from django.views.generic import RedirectView
from django.conf import settings
...
urlpatterns += patterns('',
  url(r'^(?P<lang>[a-z]{2})-[A-Za-z]{2}/(?P<path>.*)$', RedirectView.as_view(url='/%(lang)s/%(path)s',query_string=True)),
  url(r'^[a-z]{2}/(?P<path>.*)$', RedirectView.as_view(url='/{}/%(path)s'.format(settings.LANGUAGE_CODE),query_string=True)),
)

• Any xx-YY not handled by i18n pattern redirected to xx
• Any xx not handled by i18n pattern redirected to default language set using LANGUAGE_CODE.

[Melvyn Sopacua]

On Monday 08 May 2017 09:27:52 Abdullah Sh. wrote:

> Well as far I can test, Django i18n does supports fall-back 'xx-YY' to

> 'xx' then to default ('en' in my case) but only for 'Accept-Language'

> user agent header. It does not do same for URL language switch.

 

Could you please report this as a bug (maybe feature request)? I've dealt with this too but didn't chase it down, so thanks a bunch for that.

 

From end-user perspective, there are not that many that are aware of the language setting of their browser. If one wants to switch language and you have one of those language switchers in your site it should always be prefered over Accept-Language header in my opinion.

--

Melvyn Sopacua