diff --git a/modules/oe_whitelabel_helper/src/EuropeanUnionLanguages.php b/modules/oe_whitelabel_helper/src/EuropeanUnionLanguages.php
new file mode 100644
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+++ b/modules/oe_whitelabel_helper/src/EuropeanUnionLanguages.php
@@ -0,0 +1,118 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Drupal\oe_whitelabel_helper;
+
+/**
+ * Helper class storing European Union languages information.
+ */
+class EuropeanUnionLanguages {
+
+  /**
+   * List of European Union languages.
+   *
+   * Each entry includes:
+   *
+   * - The language name in English
+   * - The language name in its native form
+   * - The internal language ID, used on URLs, asset names, etc.
+   *
+   * @var array
+   */
+  protected static $languages = [
+    'bg' => ['Bulgarian', 'български', 'bg'],
+    'cs' => ['Czech', 'čeština', 'cs'],
+    'da' => ['Danish', 'dansk', 'da'],
+    'de' => ['German', 'Deutsch', 'de'],
+    'et' => ['Estonian', 'eesti', 'et'],
+    'el' => ['Greek', 'ελληνικά', 'el'],
+    'en' => ['English', 'English', 'en'],
+    'es' => ['Spanish', 'español', 'es'],
+    'fr' => ['French', 'français', 'fr'],
+    'ga' => ['Irish', 'Gaeilge', 'ga'],
+    'hr' => ['Croatian', 'hrvatski', 'hr'],
+    'it' => ['Italian', 'italiano', 'it'],
+    'lt' => ['Lithuanian', 'lietuvių', 'lt'],
+    'lv' => ['Latvian', 'latviešu', 'lv'],
+    'hu' => ['Hungarian', 'magyar', 'hu'],
+    'mt' => ['Maltese', 'Malti', 'mt'],
+    'nl' => ['Dutch', 'Nederlands', 'nl'],
+    'pl' => ['Polish', 'polski', 'pl'],
+    'pt-pt' => ['Portuguese', 'português', 'pt'],
+    'ro' => ['Romanian', 'română', 'ro'],
+    'sk' => ['Slovak', 'slovenčina', 'sk'],
+    'sl' => ['Slovenian', 'slovenščina', 'sl'],
+    'fi' => ['Finnish', 'suomi', 'fi'],
+    'sv' => ['Swedish', 'svenska', 'sv'],
+  ];
+
+  /**
+   * Returns a list of language data.
+   *
+   * This is the data that is expected to be returned by the overridden language
+   * manager as supplied by the OpenEuropa Multilingual module.
+   *
+   * @return array
+   *   An array with language codes as keys, and English and native language
+   *   names as values.
+   */
+  public static function getLanguageList(): array {
+    return self::$languages;
+  }
+
+  /**
+   * Assert whether the given language is a European Union one.
+   *
+   * @param string $language_code
+   *   The language code as defined by the W3C language tags document.
+   *
+   * @return bool
+   *   Whereas the given language is a European Union one.
+   */
+  public static function hasLanguage(string $language_code): bool {
+    return isset(self::$languages[$language_code]);
+  }
+
+  /**
+   * Get the language name in English given its W3C code.
+   *
+   * @param string $language_code
+   *   The language code as defined by the W3C language tags document.
+   *
+   * @return string
+   *   The language name in English if any, an empty string otherwise.
+   */
+  public static function getEnglishLanguageName(string $language_code): string {
+    return self::$languages[$language_code][0] ?? '';
+  }
+
+  /**
+   * Get the native language name given its W3C code.
+   *
+   * @param string $language_code
+   *   The language code as defined by the W3C language tags document.
+   *
+   * @return string
+   *   The native language name if any, an empty string otherwise.
+   */
+  public static function getNativeLanguageName(string $language_code): string {
+    return self::$languages[$language_code][1] ?? '';
+  }
+
+  /**
+   * Get the internal language code given its W3C code.
+   *
+   * Internal language codes may differ from the standard ones.
+   *
+   * @param string $language_code
+   *   The language code as defined by the W3C language tags document.
+   *
+   * @return string
+   *   The internal language code if any, an empty string otherwise.
+   */
+  public static function getInternalLanguageCode(string $language_code): string {
+    return self::$languages[$language_code][2] ?? '';
+  }
+
+}