product attribute - deny HTML tags for labels

Author: Burlacu Vasilii

app/code/Magento/Catalog/view/adminhtml/templates/catalog/product/attribute/labels.phtml

@@ -29,7 +29,7 @@
                         <?php $_labels = $block->getLabelValues() ?>
                         <?php foreach ($block->getStores() as $_store) :?>
                             <td class="col-store-view">
-                                <input class="input-text<?php if ($_store->getId() == \Magento\Store\Model\Store::DEFAULT_STORE_ID) :?> required-option<?php endif; ?>"
+                                <input class="input-text validate-no-html-tags<?php if ($_store->getId() == \Magento\Store\Model\Store::DEFAULT_STORE_ID) :?> required-option<?php endif; ?>"
                                        type="text"
                                        name="frontend_label[<?= $block->escapeHtmlAttr($_store->getId()) ?>]"
                                        value="<?= $block->escapeHtmlAttr($_labels[$_store->getId()]) ?>"

app/code/Magento/Catalog/view/adminhtml/ui_component/product_attribute_add_form.xml

@@ -63,6 +63,7 @@
                 <required>true</required>
                 <validation>
                     <rule name="required-entry" xsi:type="boolean">true</rule>
+                    <rule name="validate-no-html-tags" xsi:type="boolean">true</rule>
                 </validation>
                 <dataType>string</dataType>
                 <label translate="true">Attribute Label</label>

app/code/Magento/Eav/Block/Adminhtml/Attribute/Edit/Main/AbstractMain.php

@@ -130,7 +130,8 @@ protected function _prepareForm()
                 'label' => __('Default Label'),
                 'title' => __('Default label'),
                 'required' => true,
-                'value' => is_array($labels) ? $labels[0] : $labels
+                'value' => is_array($labels) ? $labels[0] : $labels,
+                'class' => 'validate-no-html-tags',
             ]
         );