Setting Up a Language-Switching Button in Django - django

Question

I'm new to Django and would like some advice on how to set up a single language switching button to switch between two languages (English and Japanese in this case), and specifically how to set up this functionality in a view and access it from a template.
In the template, I've arrived at the following which works but it includes repeated code for the form and the button, which obviously isn't great.
{% get_current_language as LANGUAGE_CODE %}
{% ifequal LANGUAGE_CODE 'en' %}
<form action="{% url 'set_language' %}" method="post" id="form_{{ 'ja' }}" >
{% csrf_token %}
<input name="next" type="hidden" value="{{ redirect_to }}" />
<input name="language" type="hidden" value="{{ 'ja' }}" />
</form>
<button class="btn btn-sm btn-outline-primary" type="submit" form="form_{{ 'ja' }}" value="Submit">日本語</button>
{% else %}
<form action="{% url 'set_language' %}" method="post" id="form_{{ 'en' }}" >
{% csrf_token %}
<input name="next" type="hidden" value="{{ redirect_to }}" />
<input name="language" type="hidden" value="{{ 'en' }}" />
</form>
<button class="btn btn-sm btn-outline-primary" type="submit" form="form_{{ 'en' }}" value="Submit">English</button>
{% endifequal %}
My apologies for the beginner question but I'd really appreciate some advice as to how to put the above logic into a view and access it from the template. Thanks in advance.

Answer 1

In case this is useful to anyone, I solved this problem as follows using a custom filter included in a file I called language_selector.py.
In language_selector.py:
from django import template
register = template.Library()
#register.filter
def new_lang_code(current_lang_code):
if current_lang_code == ‘en’:
return ‘ja’
else:
return ‘en’
#register.filter
def new_lang_name(current_lang_code):
if current_lang_code == ‘en’:
return ‘日本語’
else:
return ‘English’
Set up a template tags directory containing the above file.
app/
__init__.py
models.py
templatetags/
__init__.py
language_selector.py
views.py
In the template:
{% load language_selector %}
⋮
<form action=“{% url ‘set_language’ %}” method=“post” id=“form_{{ LANGUAGE_CODE|new_lang_code }}” >
{% csrf_token %}
<input name=“next” type=“hidden” value=“{{ redirect_to }}” />
<input name=“language” type=“hidden” value=“{{ LANGUAGE_CODE|new_lang_code }}” />
</form>
<button class=“btn btn-sm btn-outline-primary” type=“submit” form=“form_{{ LANGUAGE_CODE|new_lang_code }}” value=“Submit”>{{ LANGUAGE_CODE|new_lang_name }}</button>
This works and seems to be a simple and clean way to implement a language-switching button, but any comments are welcome if there are better ways to do this.