Django template translation not working as expected

I am using django 2.1 , here is all the settings related to translation:

MIDDLEWARE = [      'corsheaders.middleware.CorsMiddleware',      '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.messages.middleware.MessageMiddleware',      'django.middleware.clickjacking.XFrameOptionsMiddleware',      'debug_toolbar.middleware.DebugToolbarMiddleware',  ]    LANGUAGE_CODE = 'en'    LANGUAGES = (      ('en', _('English')),      ('bn', _('Bengali'))  )    LOCALE_PATH = (      os.path.join(BASE_DIR, 'locale')  )    TIME_ZONE = 'Asia/Dhaka'    USE_I18N = True    USE_L10N = True    USE_TZ = False

Template tag that I want to translate:

{% load i18n %}  <div class="widget widget-about">        <h4 class="widget-title">{% trans "About Us" %}</h4>  </div

I run both ./manage.py makemessages --all ./manage.py compilemessages commands , also added translation in .po file after makemessages command:

# locale/bn/LC_MESSAGES/django.po  #: templates/partials/footer.html:8  msgid "About Us"  msgstr "আমাদের সম্পর্কে"

When I changed the language code from en to bn, template string still rendering the default english "About Us".

Here are all the codes that I am using for changing language:

<div class="header-dropdown">                          {% get_current_language as LANGUAGE_CODE %}                          {% if LANGUAGE_CODE == 'en' %}                              <a href="#"><img src="{% static 'image/flag/en.png' %}" alt="flag">ENGLISH</a>                          {% else %}                              <a href="#"><img src="{% static 'image/flag/bn.png' %}" alt="flag">বাংলা</a>                          {% endif %}                          <div class="header-menu">                              <ul>                                  <li><a href="{% url 'change_language' %}?lan=en"><img src="{% static 'image/flag/en.png' %}" alt="USA Flag">ENGLISH</a></li>                                  <li><a href="{% url 'change_language' %}?lan=bn"><img src="{% static 'image/flag/bn.png' %}" alt="Bangladesh Flag">বাংলা</a></li>                              </ul>                          </div><!-- End .header-menu --> 

views.py :

def change_lan(request):      allowed_lan = ('en', 'bn')      get_lan = request.GET.get('lan', 'en')      if get_lan in allowed_lan:          translation.activate(get_lan)          request.session[translation.LANGUAGE_SESSION_KEY] = get_lan          return redirect(request.META.get('HTTP_REFERER', '/'))      else:          return redirect(request.META.get('HTTP_REFERER', '/'))

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