Pontoon: Update Italian (it) localization of Firefox Send

Localization authors:
- Francesco Lodolo <francesco.lodolo@mozillaitalia.org>

public/locales/it/send.ftl

@@ -74,7 +74,17 @@ timespanWeeks =
        *[other] { $num } settimane
     }
 fileCount = { $num } file
-# size is a localized number followed by a unit of bytes, ex. 2.5GB
+# 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 }
+# $size is the size of the file, displayed using the fileSize message as format (e.g. "2.5MB")
 totalSize = Dimensione totale: { $size }
 # the next line after the colon contains a file name
 copyLinkDescription = Copia il link per condividere il file:
@@ -102,15 +112,15 @@ uploadButton = Carica
 # the first part of the string 'Drag and drop files or click to send up to 1GB'
 dragAndDropFiles = Trascina e rilascia i file
 # the second part of the string 'Drag and drop files or click to send up to 1GB'
-# size is a localized number followed by a unit of bytes, ex. 2.5GB
+# $size is the size of the file, displayed using the fileSize message as format (e.g. "2.5MB")
 orClickWithSize = o fai clic per inviare fino a { $size }
 addPassword = Proteggi con una password
 emailPlaceholder = Inserisci il tuo indirizzo email
-# size is a localized number followed by a unit of bytes, ex. 2.5GB
+# $size is the size of the file, displayed using the fileSize message as format (e.g. "2.5MB")
 signInSizeBump = Accedi per inviare fino a { $size }
 signInButton = Accedi o registrati
 accountBenefitTitle = Crea un account { -firefox } o accedi
-# size is a localized number followed by a unit of bytes, ex. 2.5GB
+# $size is the size of the file, displayed using the fileSize message as format (e.g. "2.5MB")
 accountBenefitLargeFiles = Condividi file fino a { $size }
 accountBenefitDownloadCount = Condividi file con più persone
 accountBenefitTimeLimit =