Add language settings for users, and translate titles to French

app/controllers/application_controller.rb

@@ -2,7 +2,7 @@ class ApplicationController < ActionController::Base
   include Authentication
   include Pundit::Authorization
 
-  before_action :set_title, :set_current_user
+  before_action :set_title, :set_current_user, :set_lang
   after_action :verify_authorized
 
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
@@ -23,6 +23,10 @@ class ApplicationController < ActionController::Base
     @current_user = current_user
   end
 
+  def set_lang
+    I18n.locale = @current_user.lang if @current_user
+  end
+
   def user_not_authorized(exception)
     policy_name = exception.policy.class.to_s.underscore
 

app/controllers/users_controller.rb

@@ -55,6 +55,6 @@ class UsersController < ApplicationController
   end
 
   def user_params
-    params.expect(user: [ :username, :email_address, :password ])
+    params.expect(user: [ :username, :email_address, :lang, :password ])
   end
 end