Resolve "Delete Template" and "Convert to Plain Text" confirm message (at Edit email template) should have the Magento Backend Design (issue 24082)

Author: edenduong

app/code/Magento/Email/view/adminhtml/templates/template/edit.phtml

@@ -61,10 +61,11 @@ require([
     "jquery",
     "wysiwygAdapter",
     "Magento_Ui/js/modal/alert",
+    'Magento_Ui/js/modal/confirm',
     "mage/mage",
     "Magento_Email/js/variables",
     "prototype"
-], function(jQuery, tinyMCE, alert){
+], function(jQuery, tinyMCE, alert, confirm){
 
 //<![CDATA[
     jQuery('#email_template_edit_form').mage('form').mage('validation');
@@ -113,18 +114,22 @@ require([
         },
 
         stripTags: function () {
-            if(!window.confirm("<?= $block->escapeJs($block->escapeHtml(__('Are you sure you want to strip tags?'))) ?>")) {
-                return false;
-            }
-            this.unconvertedText = $('template_text').value;
-            $('convert_button').hide();
-            $('template_text').value =  $('template_text').value.stripScripts().replace(
-                new RegExp('<style[^>]*>[\\S\\s]*?</style>', 'img'), ''
-            ).stripTags().strip();
-            $('convert_button_back').show();
-            $('field_template_styles').hide();
-            this.typeChange = true;
-            return false;
+            confirm({
+                content: "<?= $block->escapeJs($block->escapeHtml(__('Are you sure you want to strip tags?'))) ?>",
+                actions: {
+                    confirm: function () {
+                        this.unconvertedText = $('template_text').value;
+                        $('convert_button').hide();
+                        $('template_text').value =  $('template_text').value.stripScripts().replace(
+                            new RegExp('<style[^>]*>[\\S\\s]*?</style>', 'img'), ''
+                        ).stripTags().strip();
+                        $('convert_button_back').show();
+                        $('field_template_styles').hide();
+                        this.typeChange = true;
+                        return false;
+                    }
+                }
+            });
         },
         unStripTags: function () {
             $('convert_button').show();
@@ -164,9 +169,14 @@ require([
         },
 
         deleteTemplate: function() {
-            if(window.confirm("<?= $block->escapeJs($block->escapeHtml(__('Are you sure you want to delete this template?'))) ?>")) {
-                   window.location.href = '<?= $block->escapeJs($block->escapeUrl($block->getDeleteUrl())) ?>';
-            }
+            confirm({
+                content: "<?= $block->escapeJs($block->escapeHtml(__('Are you sure you want to delete this template?'))) ?>",
+                actions: {
+                    confirm: function () {
+                        window.location.href = '<?= $block->escapeJs($block->escapeUrl($block->getDeleteUrl())) ?>';
+                    }
+                }
+            });
         },
 
         load: function() {