Change wording for long operation warning

Author: JamesAnelay

app/code/Magento/Catalog/view/adminhtml/templates/catalog/category/edit/form.phtml

@@ -54,7 +54,7 @@ $categoryId = $block->getCategoryId();
 
 <div data-id="information-dialog-category" class="messages admin__scope" style="display: none;">
     <div class="message message-notice">
-        <div><?php echo __('This operation can take much time'); ?></div>
+        <div><?php echo __('This operation can take a long time'); ?></div>
     </div>
 </div>
 

app/code/Magento/Catalog/view/adminhtml/templates/catalog/category/tree.phtml

@@ -32,7 +32,7 @@
 
 <div data-id="information-dialog-tree" class="messages admin__scope" style="display: none;">
     <div class="message message-notice">
-       <div><?php echo __('This operation can take much time'); ?></div>
+       <div><?php echo __('This operation can take a long time'); ?></div>
     </div>
 </div>
 <!--[if IE]>