reverted:
--- b/core/modules/system/src/Controller/SystemController.php
+++ a/core/modules/system/src/Controller/SystemController.php
@@ -258,10 +258,10 @@
             }
             if ($theme_uninstallable) {
               $theme->operations[] = [
+                'title' => $this->t('Uninstall'),
-                'title' => $this->t('Disable'),
                 'url' => Url::fromRoute('system.theme_uninstall'),
                 'query' => $query,
+                'attributes' => ['title' => $this->t('Uninstall @theme theme', ['@theme' => $theme->info['name']])],
-                'attributes' => ['title' => $this->t('Disable @theme theme', ['@theme' => $theme->info['name']])],
               ];
             }
             $theme->operations[] = [