Merge pull request #4782 from lmorchard/subplat-email-missed-l10n-strings

fix(payments): mark up some missed subplat email template strings

packages/fxa-auth-server/lib/senders/templates/subscriptionFirstInvoice.txt

@@ -14,6 +14,6 @@
 
 {{{t "Next Invoice: %(nextInvoiceDateOnly)s" }}}
 
-Questions about your subscription? Our support team is here to help you:
+{{{t "Questions about your subscription? Our support team is here to help you:" }}}
 
 {{{subscriptionSupportUrl}}}

packages/fxa-auth-server/lib/senders/templates/subscriptionSubsequentInvoice.html

@@ -15,7 +15,7 @@
             <table cellspacing="0" cellpadding="0">
              <tr>
               <td style="font-family:Helvetica, Geneva, Tahoma, Verdana, sans-serif; font-size: 22px; color: #464646;text-align:center !important;" width="640" align="center">
-                <b>Thank you for being a subscriber!</b>
+                <b>{{t "Thank you for being a subscriber!" }}</b>
               </td>
              </tr>
             </table>