diff -u b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
--- b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
@@ -133,7 +133,7 @@
 
     // Test that language settings are correctly stored.
     $language_configuration = ContentLanguageSettings::loadByEntityTypeBundle('comment', 'comment_article');
-    $this->assertEqual($language_configuration->getDefaultLangcode(), 'current_interface', 'The default language for article comments is set to the current interface language.');
+    $this->assertEqual($language_configuration->getDefaultLangcode(), 'current_interface', 'The default language for article comments is set to the interface text language selected for page.');
     $this->assertTrue($language_configuration->isLanguageAlterable(), 'The language selector for article comments is shown.');
 
     // Verify language widget appears on comment type form.
diff -u b/core/modules/views/src/Plugin/views/PluginBase.php b/core/modules/views/src/Plugin/views/PluginBase.php
--- b/core/modules/views/src/Plugin/views/PluginBase.php
+++ b/core/modules/views/src/Plugin/views/PluginBase.php
@@ -170,7 +170,7 @@
    *   An array which describes the options of a plugin. Each element is an
    *   associative array containing:
    *   - default: The default value of one option. Should be translated to the
-   *     current interface language if translatable.
+   *     interface text language selected for page if translatable.
    *   - (optional) contains: An array which describes the available options
    *     under the key. If contains is set, the default will be ignored and
    *     assumed to be an empty array.
only in patch2:
unchanged:
--- a/core/modules/language/src/Element/LanguageConfiguration.php
+++ b/core/modules/language/src/Element/LanguageConfiguration.php
@@ -97,7 +97,7 @@ public static function processLanguageConfiguration(&$element, FormStateInterfac
   protected static function getDefaultOptions() {
     $language_options = array(
       LanguageInterface::LANGCODE_SITE_DEFAULT => t("Site's default language (!language)", array('!language' => static::languageManager()->getDefaultLanguage()->getName())),
-      'current_interface' => t('Current interface language'),
+      'current_interface' => t('Interface text language selected for page'),
       'authors_default' => t("Author's preferred language"),
     );
 
only in patch2:
unchanged:
--- a/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUI.php
+++ b/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUI.php
@@ -11,7 +11,8 @@
 use Symfony\Component\HttpFoundation\Request;
 
 /**
- * Class for identifying the language from the current interface language.
+ * Class for identifying the language from the interface text language selected
+ * for page.
  *
  * @Plugin(
  *   id = Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUI::METHOD_ID,
only in patch2:
unchanged:
--- a/core/modules/language/tests/language_test/language_test.routing.yml
+++ b/core/modules/language/tests/language_test/language_test.routing.yml
@@ -29,5 +29,5 @@ language_test.entity_using_current_language:
     parameters:
       configurable_language:
         type: entity:configurable_language
-        # Force load in current interface language.
+        # Force load in the interface text language selected for page.
         with_config_overrides: TRUE
only in patch2:
unchanged:
--- a/core/modules/system/core.api.php
+++ b/core/modules/system/core.api.php
@@ -384,7 +384,7 @@
  * - Define a Cache ID (cid) value for your data. A cid is a string, which must
  *   contain enough information to uniquely identify the data. For example, if
  *   your data contains translated strings, then your cid value must include the
- *   current interface language.
+ *   interface text language selected for page.
  * - Call the get() method to attempt a cache read, to see if the cache already
  *   contains your data.
  * - If your data is not already in the cache, compute it and add it to the