Add language selection feature and internationalization support

intl_tools/admin.py

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+# Register your models here.

intl_tools/apps.py

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+from django.apps import AppConfig
+
+
+class IntlToolsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'intl_tools'

intl_tools/forms.py

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+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Column, Layout, Row, Submit
+from django import forms
+from django.conf import settings
+from django.utils.translation import gettext_lazy as _
+
+
+class LanguageForm(forms.Form):
+    language = forms.ChoiceField(
+        choices=settings.LANGUAGES,
+        label=_("Language"),
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.form_method = 'post'
+        self.helper.layout = Layout(
+            Row(
+                Column('language', css_class='col-md-6'),
+            ),
+            Submit('submit', _("Change Language"), css_class='btn btn-primary')
+        )

intl_tools/models.py

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+# Create your models here.

intl_tools/tests.py

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+# Create your tests here.

intl_tools/views.py

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+from django.conf import settings
+from django.shortcuts import redirect, render
+from django.utils import translation
+
+from .forms import LanguageForm
+
+
+def view_change_language(request):
+    if request.method == 'POST':
+        form = LanguageForm(request.POST)
+        if form.is_valid():
+            language = form.cleaned_data['language']
+            translation.activate(language)
+            request.session['django_language'] = language
+            next_url = '/'
+            response = redirect(next_url)
+            response.set_cookie(settings.LANGUAGE_COOKIE_NAME, language)
+            return response
+    else:
+        form = LanguageForm(initial={'language': translation.get_language()})
+
+    if request.user.is_authenticated:
+        return render(request, 'generic_form.html', {'form': form})
+    else:
+        return render(request, 'generic_form_guest.html', {'form': form})