feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/system/tests/classes/CoreLangTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace System\Tests\Classes;
+
+use System\Tests\Bootstrap\TestCase;
+use System\Classes\PluginManager;
+use Validator;
+
+class CoreLangTest extends TestCase
+{
+    public function testValidationTranslator()
+    {
+        $translator = $this->app['translator'];
+        $translator->setLocale('en');
+
+        $validator = Validator::make(
+            ['name' => 'me'],
+            ['name' => 'required|min:5']
+        );
+
+        $this->assertTrue($validator->fails());
+
+        $messages = $validator->messages();
+        $this->assertCount(1, $messages);
+        $this->assertEquals('The name must be at least 5 characters.', $messages->all()[0]);
+    }
+
+    public function testValidCoreLanguageFiles()
+    {
+        $translator = $this->app['translator'];
+        $locales = $translator->get('system::lang.locale');
+        $this->assertNotEmpty($locales);
+
+        $locales = array_keys($locales);
+        $modules = ['system', 'backend', 'cms'];
+        $files = ['lang.php', 'validation.php', 'client.php'];
+
+        foreach ($modules as $module) {
+            foreach ($locales as $locale) {
+                foreach ($files as $file) {
+                    $srcPath = base_path() . '/modules/'.$module.'/lang/'.$locale.'/'.$file;
+                    if (!file_exists($srcPath)) {
+                        continue;
+                    }
+                    $messages = require $srcPath;
+                    $this->assertNotEmpty($messages);
+                    $this->assertNotCount(0, $messages);
+                }
+            }
+        }
+    }
+}