chore: Translate transifex_input.json in it_IT

99% 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

@@ -32,6 +32,8 @@
   "course-authoring.content-tags-drawer.tags-dropdown-selector.no-tags-found": "Nessun tag trovato con il termine di ricerca " {searchTerm} "",
   "course-authoring.content-tags-drawer.tags-dropdown-selector.selectable-box.aria.label": "casella di controllo {tag}",
   "course-authoring.content-tags-drawer.content-tags-collapsible.selectable-box.selection.aria.label": "selezione dei tag della tassonomia",
+  "course-authoring.content-tags-drawer.button.manage": "Gestisci tag",
+  "course-authoring.course-unit.sidebar.tags.title": "Unit Tags",
   "course-authoring.content-tags-drawer.content-tags-collapsible.custom-menu.placeholder-text": "Aggiungi un'etichetta",
   "course-authoring.content-tags-drawer.content-tags-collapsible.custom-menu.save-staged-tags": "Aggiungere etichette",
   "course-authoring.content-tags-drawer.content-tags-collapsible.custom-menu.cancel-staged-tags": "Annulla",