Multilanguage in Django 1.9

1. Write messages in all python code with: <br>

   
   from django.utils.translation import ugettext as _
   # Sample:
   location = _('Select Your Country')
   </code>
   </pre>
   <br>

2. Write messages in all HTML templates with: <br>

   
   {% load i18n %}
   <!-- Sample-->
   {% trans "Select Your City" %}
   </code>
   </pre>
   <br>

3. In settings.py:
   

   
   
   
   LANGUAGECODE = 'en'
   ugettext = lambda s: s
   LANGUAGES = (
   ('es', ugettext('Spanish')),
   ('en', ugettext('English')),
   )
   LOCALEPATHS = (
   os.path.join(BASEDIR, 'locale'),
   )
   MIDDLEWARECLASSES = [
   'django.middleware.security.SecurityMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.locale.LocaleMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'django.middleware.clickjacking.XFrameOptionsMiddleware',
   ]
   </code>
   </pre>

4. Add URLs:
   

   
   
   
   url(r'^i18n/', include('django.conf.urls.i18n')),
   </code>
   </pre>
   <br>

5. Add functionality to change language:
   <br>
   

   
   
   
   5.1. URLS:
   url(r'^set-language/', views.set_language, name='set-language'),
   </code>
   </pre>

5.2. VIEWS:

def setlanguage(request):
    return render(request, 'set-language.html', {'LANGUAGES':settings.LANGUAGES,
                                                 'SELECTEDLANG':request.LANGUAGE_CODE})
</code>
</pre>

5.3. TEMPLATES:


<form action="/i18n/setlang/" method="post">
    {% csrftoken %}
    <input name="next" type="hidden" value="/" />
    <select name="language">
        {% for lang in LANGUAGES %}
                <option value="{{ lang.0 }}" {% if lang.0 == SELECTEDLANG %}selected{% endif %}>{% if lang.1 == 'Spanish' %}Español{% else %}{{ lang.1 }}{% endif %}</option>
        {% endfor %}
    </select>
    <input type="submit" value="Go" />
</form>
</code>
</pre>


Create language files
django-admin.py makemessages -l es
Explore language files changes:
django-admin.py makemessages -a
Install Rosseta to admin traductions:
pip install django-rosetta
Add to URLs:


url(r'^rosetta/', include('rosetta.urls')),
</code>
</pre>
Add to settings.py apps:
'rosetta',
In case to be needed (Rosetta do it) recompile:
django-admin.py compilemessages
IMPORTANT
With Rosseta in English language may happens this error:
ValueError, 'plural forms expression could be dangerous'


To fix it:
A. Remove Rosseta (settings y urls) when all translations are done.
B. To add Rosseta again, change language to Spanish in settings (LANGUAGECODE) and with setlanguage view. And then apply step A.