diff --git a/core/modules/config_translation/src/Tests/ConfigTranslationUiThemeTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationUiThemeTest.php
index 53713a9..7e69be8 100644
--- a/core/modules/config_translation/src/Tests/ConfigTranslationUiThemeTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationUiThemeTest.php
@@ -55,14 +55,14 @@ protected function setUp() {
    * Tests that theme provided *.config_translation.yml files are found.
    */
   public function testThemeDiscovery() {
-    // Install the test theme and rebuild routes.
+    // Enable the test theme and rebuild routes.
     $theme = 'config_translation_test_theme';
 
     $this->drupalLogin($this->adminUser);
 
     $this->drupalGet('admin/appearance');
     $elements = $this->xpath('//a[normalize-space()=:label and contains(@href, :theme)]', [
-      ':label' => 'Install and set as default',
+      ':label' => 'Enable and set as default',
       ':theme' => $theme,
     ]);
     $this->drupalGet($GLOBALS['base_root'] . $elements[0]['href'], ['external' => TRUE]);
diff --git a/core/modules/system/src/Tests/System/ThemeTest.php b/core/modules/system/src/Tests/System/ThemeTest.php
index d0e372e..ded8c8f 100644
--- a/core/modules/system/src/Tests/System/ThemeTest.php
+++ b/core/modules/system/src/Tests/System/ThemeTest.php
@@ -378,8 +378,8 @@ public function testUninstallingThemes() {
     ];
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
 
-    // Check that seven can be uninstalled now.
-    $this->assertRaw('Uninstall Seven theme', 'A link to uninstall the Seven theme does appear on the theme settings page.');
+    // Check that seven can be disabled now.
+    $this->assertRaw('Disable Seven theme', 'A link to Disable the Seven theme does appear on the theme settings page.');
     // Check that the classy theme still cannot be uninstalled as it is a
     // base theme of bartik.
     $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
@@ -387,19 +387,19 @@ public function testUninstallingThemes() {
     // Change the default theme to stark, stark is second in the list.
     $this->clickLink(t('Set as default'), 1);
 
-    // Check that bartik can be uninstalled now.
-    $this->assertRaw('Uninstall Bartik theme', 'A link to uninstall the Bartik theme does appear on the theme settings page.');
+    // Check that bartik can be disabled now.
+    $this->assertRaw('Disable Bartik theme', 'A link to uninstall the Bartik theme does appear on the theme settings page.');
 
     // Check that the classy theme still can't be uninstalled as neither of it's
     // base themes have been.
     $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
 
-    // Uninstall each of the three themes starting with Bartik.
-    $this->clickLink(t('Uninstall'));
-    $this->assertRaw('The <em class="placeholder">Bartik</em> theme has been uninstalled');
+    // Disable each of the three themes starting with Bartik.
+    $this->clickLink(t('Disable'));
+    $this->assertRaw('The <em class="placeholder">Bartik</em> theme has been Disabled');
     // Seven is the second in the list.
-    $this->clickLink(t('Uninstall'));
-    $this->assertRaw('The <em class="placeholder">Seven</em> theme has been uninstalled');
+    $this->clickLink(t('Disable'));
+    $this->assertRaw('The <em class="placeholder">Seven</em> theme has been Disabled');
 
     // Check that the classy theme still can't be uninstalled as it is hidden.
     $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');