Add cookie-based language selection to user settings.

This will likely be refactored to use a database column instead of dropping a cookie.

babybuddy/templates/babybuddy/user_settings_form.html

@@ -1,5 +1,5 @@
 {% extends 'babybuddy/page.html' %}
-{% load widget_tweaks %}
+{% load i18n widget_tweaks %}
 
 {% block title %}User Settings{% endblock %}
 
@@ -41,6 +41,23 @@
                         {% include 'babybuddy/form_field.html' %}
                     {% endwith %}
                 </div>
+                <div class="form-group row">
+                    <label for="id_language" class="col-sm-2 col-form-label">
+                        Language
+                    </label>
+                    <div class="col-sm-10">
+                        <select name="language">
+                            {% get_current_language as LANGUAGE_CODE %}
+                            {% get_available_languages as LANGUAGES %}
+                            {% get_language_info_list for LANGUAGES as languages %}
+                            {% for language in languages %}
+                                <option value="{{ language.code }}"{% if language.code == LANGUAGE_CODE %} selected{% endif %}>
+                                    {{ language.name_local }} ({{ language.code }})
+                                </option>
+                            {% endfor %}
+                        </select>
+                    </div>
+                </div>
             </fieldset>
             <fieldset>
                 <legend>Dashboard</legend>

babybuddy/urls.py

@@ -53,6 +53,7 @@ urlpatterns = [
     path('admin/', admin.site.urls),
     path('', include('api.urls', namespace='api')),
     path('', include((app_patterns, 'babybuddy'), namespace='babybuddy')),
+    path('user/lang', include('django.conf.urls.i18n')),
     path('', include('core.urls', namespace='core')),
     path('', include('dashboard.urls', namespace='dashboard')),
     path('', include('reports.urls', namespace='reports')),

babybuddy/views.py

@@ -10,6 +10,7 @@ from django.urls import reverse, reverse_lazy
 from django.views.generic import View
 from django.views.generic.base import TemplateView, RedirectView
 from django.views.generic.edit import CreateView, UpdateView, DeleteView
+from django.views.i18n import set_language
 
 from django_filters.views import FilterView
 
@@ -135,6 +136,7 @@ class UserSettings(LoginRequiredMixin, View):
             user_settings = form_settings.save(commit=False)
             user.settings = user_settings
             user.save()
+            set_language(request)
             messages.success(request, 'Settings saved!')
             return redirect('babybuddy:user-settings')
         return render(request, self.template_name, {