add brand name Premium

locales/en/app.ftl

@@ -8,6 +8,7 @@
 -product-short-name = Monitor
 -brand-name = Firefox
 -brand-Mozilla = Mozilla
+-brand-premium = Premium
 -brand-HIBP = Have I Been Pwned
 -brand-fxa = Firefox Account
 -brand-pocket = Pocket

locales/en/settings.ftl

@@ -44,7 +44,7 @@ settings-email-number-of-breaches-info =
 
 ## Cancel Premium subscription
 
-settings-cancel-premium-subscription-title = Cancel Premium subscription
+settings-cancel-premium-subscription-title = Cancel { -brand-premium } subscription
 settings-cancel-premium-subscription-info = Your subscription will revert to a free account after the current billing cycle ends. Your privacy protection scan results will be permanently deleted, and you’ll only have data breach monitoring for 1 email address.
 settings-cancel-premium-subscription-link-label = Cancel from your { -brand-firefox } settings