According to the translation documentation you can use the available language tools either in the template or in the python code.
In the template, using the get_language_info template tag: {% raw %}
{% get_language_info for "pl" as lang %}
Language code: {{ lang.code }}<br />
Name of language: {{ lang.name_local }}<br />
Name in English: {{ lang.name }}<br />
Bi-directional: {{ lang.bidi }}
Name in the active language: {{ lang.name_translated }}
{% endraw %}
which can be combined with other tags and build a mechanism that allows you to change languages:
{% raw %}
{% for lang_code, lang_name in languages %}
{% if lang_code != LANGUAGE_CODE %}
{% get_language_info for lang_code as lang_info %}
{% language lang_code %}
{% url request.resolver_match.url_name as no_slug %}
{% url request.resolver_match.url_name slug=object.slug as yes_slug %}
<p>Link to: {% firstof yes_slug no_slug %} Local name: {{ lang_info.name_local }}</p>
{% endlanguage %}
{% endif %}
{% endfor %}
{% endraw %}