MAGETWO-55809: Eliminate @escapeNotVerified in Module Backend

Author: Oleksandr Gorkun

app/code/Magento/Backend/view/adminhtml/templates/widget/grid.phtml

@@ -104,7 +104,7 @@ $numColumns = $block->getColumns() !== null ? count($block->getColumns()) : 0;
                                 <?= /* @noEscape */ __('of %1', '<span>' . $block->getCollection()->getLastPageNumber() . '</span>') ?>
                             </label>
                             <?php if ($_curPage < $_lastPage) : ?>
-                                <button type="button" title="<?= $block->escapeHtml(__('Next page')) ?>"
+                                <button type="button" title="<?= $block->escapeHtmlAttr(__('Next page')) ?>"
                                         class="action-next"
                                         onclick="<?= /* @noEscape */ $block->getJsObjectName() ?>.setPage('<?= /* @noEscape */ ($_curPage + 1) ?>');return false;">
                                     <span><?= $block->escapeHtml(__('Next page')) ?></span>

app/code/Magento/Backend/view/adminhtml/templates/widget/tabshoriz.phtml

@@ -17,9 +17,9 @@
     <li>
         <a href="<?= $block->escapeHtmlAttr($_tabHref) ?>" id="<?= $block->escapeHtmlAttr($block->getTabId($_tab)) ?>" title="<?= $block->escapeHtmlAttr($block->getTabTitle($_tab)) ?>" class="<?= $block->escapeHtmlAttr($_tabClass) ?>" data-tab-type="<?= $block->escapeHtmlAttr($_tabType) ?>">
             <span>
-                <span class="changed" title="<?= $block->escapeHtml(__('The information in this tab has been changed.')) ?>"></span>
-                <span class="error" title="<?= $block->escapeHtml(__('This tab contains invalid data. Please resolve this before saving.')) ?>"></span>
-                <span class="loader" title="<?= $block->escapeHtml(__('Loading...')) ?>"></span>
+                <span class="changed" title="<?= $block->escapeHtmlAttr(__('The information in this tab has been changed.')) ?>"></span>
+                <span class="error" title="<?= $block->escapeHtmlAttr(__('This tab contains invalid data. Please resolve this before saving.')) ?>"></span>
+                <span class="loader" title="<?= $block->escapeHtmlAttr(__('Loading...')) ?>"></span>
                 <?= $block->escapeHtml($block->getTabLabel($_tab)) ?>
             </span>
         </a>