chore: Translate transifex_input.json in it_IT

98% 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-learning/src/i18n/messages/it_IT.json

@@ -32,9 +32,11 @@
   "learn.coursewareSerch.searchResultsNone": "Nessun risultato trovato.",
   "learn.coursewareSerch.searchResultsLabel": "Results for \"{keyword}\":",
   "learn.coursewareSerch.searchResultsError": "Si è verificato un errore durante il processo di ricerca. Riprova tra qualche minuto. Se il problema persiste, contatta il team di supporto.",
-  "learn.coursewareSerch.filter:none": "Tutto contenuto",
+  "learn.coursewareSerch.filter:all": "All content",
   "learn.coursewareSerch.filter:text": "Testo",
   "learn.coursewareSerch.filter:video": "Video",
+  "learn.coursewareSerch.filter:sequence": "Section",
+  "learn.coursewareSerch.filter:other": "Other",
   "learning.dates.badge.completed": "Completato",
   "learning.dates.badge.dueNext": "Prossima scadenza ",
   "learning.dates.badge.pastDue": "Scaduto ",