Pontoon: Update Mixtepec Mixtec (mix) localization of Firefox Monitor Website

Localization authors:
- Bald3mar <baldemarls@gmail.com>
- dirkar_dear <dirkar_dear@hotmail.com>

locales/mix/app.ftl

@@ -1,11 +1,20 @@
 ## The following messages are brand and should be kept entirely in English
 ## unless otherwise indicated.
 
+-product-name = Firefox Monitor
+-product-short-name = Monitor
 -brand-name = Firefox
 -brand-Mozilla = Mozilla
+-brand-HIBP = Have I Been Pwned
+-brand-fxa = Firefox Account
+-brand-pocket = Pocket
+-brand-lockwise = Firefox Lockwise
+-brand-send = Firefox Send
+-brand-fpn = Firefox Private Network
 
+##
 
-
+terms-and-privacy = Términos y Privacidad
 GitHub-link-title = GitHub
 home-title = { -product-name }
 fxa-account = { -brand-fxa }
@@ -20,5 +29,19 @@ fxa-account = { -brand-fxa }
 ## an additional email to Firefox Monitor.
 
 
+##
 
 
+## This string contains nested markup that becomes a link later in the code.
+## Please do not modify or remove "<a>" and "</a>".
+
+
+##
+
+
+## These strings contain nested markup that is later used to style the text inside of it.
+## Please do not modify or remove "<span>" and "</span>".
+
+
+##
+