Fixed inconsistent grammar

Author: drpayyne

app/code/Magento/Newsletter/etc/adminhtml/menu.xml

@@ -7,7 +7,7 @@
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Backend:etc/menu.xsd">
     <menu>
-        <add id="Magento_Newsletter::newsletter_template" title="Newsletter Template" translate="title" module="Magento_Newsletter" parent="Magento_Backend::marketing_communications" sortOrder="30" action="newsletter/template/" resource="Magento_Newsletter::template"/>
+        <add id="Magento_Newsletter::newsletter_template" title="Newsletter Templates" translate="title" module="Magento_Newsletter" parent="Magento_Backend::marketing_communications" sortOrder="30" action="newsletter/template/" resource="Magento_Newsletter::template"/>
         <add id="Magento_Newsletter::newsletter_queue" title="Newsletter Queue" translate="title" module="Magento_Newsletter" sortOrder="40" parent="Magento_Backend::marketing_communications" action="newsletter/queue/" resource="Magento_Newsletter::queue"/>
         <add id="Magento_Newsletter::newsletter_subscriber" title="Newsletter Subscribers" translate="title" module="Magento_Newsletter" sortOrder="50" parent="Magento_Backend::marketing_communications" action="newsletter/subscriber/" resource="Magento_Newsletter::subscriber"/>
         <add id="Magento_Newsletter::newsletter_problem" title="Newsletter Problem Reports" translate="title" module="Magento_Newsletter" sortOrder="50" parent="Magento_Reports::report_marketing" action="newsletter/problem/" resource="Magento_Newsletter::problem"/>