Pontoon: Update Mixtepec Mixtec (mix) localization of Firefox Send

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

public/locales/mix/send.ftl

@@ -0,0 +1,26 @@
+# Firefox Send is a brand name and should not be localized.
+title = Firefox Send
+unlockInputPlaceholder = Tu'un seè
+downloadButtonLabel = Snuù
+downloadFinish = Ntsinu snui
+fileSizeProgress = ({ $partialSize } ña { $totalSize })
+
+## Send version 2 strings
+
+-firefox = Firefox
+-mozilla = Mozilla
+# byte abbreviation
+bytes = B
+# kibibyte abbreviation
+kb = KB
+# mebibyte abbreviation
+mb = MB
+# gibibyte abbreviation
+gb = GB
+# localized number and byte abbreviation. example "2.5MB"
+fileSize = { $num }{ $units }
+downloadTitle = Snuú tutu
+downloadFirefox = Snuú { -firefox }
+legalDateStamp = Versión 1.0 del 12 de marzo de 2019
+# A short representation of a countdown timer containing the number of days, hours, and minutes remaining as digits, example "2d 11h 56m"
+expiresDaysHoursMinutes = { $days }d { $hours }h { $minutes }m