Issue #2609256 by sleitner, rkoller, smustgrave, vegantriathlete, quietone,...

Issue #2609256 by sleitner, rkoller, smustgrave, vegantriathlete, quietone, benjifisher, AaronMcHale, worldlinemine: Add warning message to import translations after enabling Interface Translation

core/modules/locale/locale.install

@@ -21,6 +21,12 @@ function locale_install() {
     \Drupal::configFactory()->getEditable('locale.settings')->set('translation.path', $directory)->save();
   }
   \Drupal::service('file_system')->prepareDirectory($directory, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
+
+  $t_args = [
+    ':translate_status' => base_path() . 'admin/reports/translations/check?destination=' . urlencode(base_path() . 'admin/reports/translations'),
+  ];
+  $message = t('Check <a href=":translate_status">available translations</a> for your language(s).', $t_args);
+  \Drupal::messenger()->addStatus($message);
 }
 
 /**

core/modules/locale/tests/src/Functional/LocaleInstallTest.php

+<?php
+
+declare(strict_types=1);
+namespace Drupal\Tests\locale\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Test installation of Locale module.
+ *
+ * @group locale
+ */
+class LocaleInstallTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'system',
+    'file',
+    'language',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * Tests Locale install message.
+   */
+  public function testLocaleInstallMessage(): void {
+    $admin_user = $this->drupalCreateUser([
+      'access administration pages',
+      'administer modules',
+    ]);
+    $this->drupalLogin($admin_user);
+
+    $edit = [];
+    $edit['modules[locale][enable]'] = 'locale';
+    $this->drupalGet('admin/modules');
+    $this->submitForm($edit, 'Install');
+
+    $this->assertSession()->statusMessageContains('available translations', 'status');
+  }
+
+}