app/Models/User.php

@@ -24,6 +24,7 @@ final class User extends Authenticatable
         'password',
         'timezone',
         'is_active',
+        'locale',
     ];
 
     /**

database/migrations/2014_10_12_000000_create_users_table.php

@@ -19,6 +19,7 @@ return new class extends Migration
             $table->timestamp('email_verified_at')->nullable();
             $table->string('password');
             $table->rememberToken();
+            $table->string('locale', 2)->default('ru');
             $table->string('timezone')->nullable();
             $table->timestamps();
             $table->softDeletes();