chore: Translate transifex_input.json in it_IT

88% of minimum 50% translated source file: 'transifex_input.json'
on 'it_IT'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/frontend-app-course-authoring/src/i18n/messages/it_IT.json

@@ -314,12 +314,12 @@
   "course-authoring.files-and-videos.sort-and-filter.modal.filter.audioCheckbox.label": "Audio",
   "course-authoring.files-and-videos.sort-and-filter.modal.filter.otherCheckbox.label": "Other",
   "course-authoring.files-and-upload.rowStatus.message": "Showing {fileCount} of {rowCount}",
-  "course-authoring.files-and-upload.apiStatus.message": "{actionType} {selectedRowCount} file/i",
+  "course-authoring.files-and-upload.apiStatus.message": "{actionType} {selectedRowCount} {fileType}(s)",
   "course-authoring.files-and-upload.apiStatus.addingAction.message": "Aggiungendo",
   "course-authoring.files-and-upload.apiStatus.deletingAction.message": "Cancellazione in corso",
   "course-authoring.files-and-upload.addFiles.error.fileSize": "I file caricati devono essere di 20 MB o meno. Ridimensiona i file e riprova.",
   "course-authoring.files-and-upload.table.noResultsFound.message": "Nessun risultato trovato ",
-  "course-authoring.files-and-upload.addFiles.button.label": "Aggiungere i file",
+  "course-authoring.files-and-upload.addFiles.button.label": "Add {fileType}s",
   "course-authoring.files-and-upload.action.button.label": "Azioni",
   "course-authoring.files-and-upload.errorAlert.message": "{message}",
   "course-authoring.files-and-uploads.file-info.usage.title": "Utilizzo",
@@ -333,11 +333,11 @@
   "course-authoring.files-and-uploads.cardMenu.infoTitle": "Info",
   "course-authoring.files-and-uploads.cardMenu.downloadEncodingsTitle": "Download video list (.csv)",
   "course-authoring.files-and-uploads.cardMenu.deleteTitle": "Cancella",
-  "course-authoring.files-and-uploads..deleteConfirmation.title": "Conferma eliminazione file(i).",
-  "course-authoring.files-and-uploads..deleteConfirmation.message": "Sei sicuro di voler eliminare i file {fileNumber} ? Questa azione non può essere annullata.",
+  "course-authoring.files-and-uploads..deleteConfirmation.title": "Delete {fileType}(s) confirmation",
+  "course-authoring.files-and-uploads..deleteConfirmation.message": "Are you sure you want to delete {fileNumber} {fileType}(s)? This action cannot be undone.",
   "course-authoring.files-and-uploads.deleteConfirmation.deleteFile.label": "Cancella",
   "course-authoring.files-and-uploads.cancelButton.label": "Annulla",
-  "course-authoring.files-and-uploads.sortButton.label": "Sort and Filter",
+  "course-authoring.files-and-uploads.sortButton.label": "Sort and filter",
   "course-authoring.files-and-uploads.sortModal.title": "Ordina per",
   "course-authoring.files-and-uploads.sortByNameAscendingButton.label": "Nome (AZ)",
   "course-authoring.files-and-uploads.sortByNewestButton.label": "Più recente",