a django template tag to switch/link the current django or wagtail view/url to another language

switch_language.py

# example usage:
#
#     {% if request.LANGUAGE_CODE == 'de' %}
#        <a href="{% switch_language 'en' %}">English</a>
#    {% else %}
#        <a href="{% switch_language 'de' %}">Deutsch</a>
#    {% endif %}
#

@register.simple_tag(takes_context=True)
def switch_language(context, requested_language=None, *args, **kwargs):
    """
    Get current page's url in requested language
    Usage: {% switch_language 'en' %}
    """
    request = context['request']

    if request.resolver_match:
        # handle wagtail pages
        if request.resolver_match.url_name == 'wagtail_serve':
            with translation.override(requested_language):
                current_page = context.get('page')
                url = current_page.relative_url(request.site)

        # handle django views
        else:
            url_parts = resolve(request.path)
            with translation.override(requested_language):
                url = reverse(url_parts.view_name, kwargs=url_parts.kwargs)

        return force_text(url)
    return ''