Add missing sentence delete category in the CSV file of catalog module

Author: edenduong

app/code/Magento/Catalog/i18n/en_US.csv

@@ -812,3 +812,4 @@ Details,Details
 "Edit Product Design","Edit Product Design"
 "Edit Category Design","Edit Category Design"
 "A total of %1 record(s) haven't been deleted. Please see server logs for more details.","A total of %1 record(s) haven't been deleted. Please see server logs for more details."
+"Are you sure you want to delete this category?","Are you sure you want to delete this category?"