Add a hint to ‘Template name’ text input

We’ve seen lots of users unsure what the ‘template name’ field is for,
especially on first use. Is it the subject line of the text message?
Will it be who the message comes from? Answer: neither.

So this commit adds a hint to make that clearer.

app/templates/views/edit-email-template.html

@@ -15,7 +15,7 @@
     <form method="post">
       <div class="grid-row">
         <div class="column-two-thirds">
-          {{ textbox(form.name, width='1-1') }}
+          {{ textbox(form.name, width='1-1', hint='Your recipients won’t see this') }}
           {{ textbox(form.subject, width='1-1') }}
         </div>
         <div class="column-two-thirds">

app/templates/views/edit-sms-template.html

@@ -15,7 +15,7 @@
     <form method="post">
       <div class="grid-row">
         <div class="column-two-thirds">
-          {{ textbox(form.name, width='1-1') }}
+          {{ textbox(form.name, width='1-1', hint='Your recipients won’t see this') }}
         </div>
         <div class="column-two-thirds">
           {{ textbox(form.template_content, highlight_tags=True, width='1-1') }}