Add language settings for users, and translate titles to French

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_03_26_162920) do
+ActiveRecord::Schema[8.0].define(version: 2025_03_27_111835) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -111,6 +111,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_03_26_162920) do
     t.datetime "updated_at", null: false
     t.string "username"
     t.boolean "admin", default: false, null: false
+    t.string "lang", default: "en"
     t.index ["email_address"], name: "index_users_on_email_address", unique: true
   end