ITALIAN translation - added last missing string

I added Afrikaans missing string

lang/languages-it.json

 {
     "en": "Inglese",
-    "af": "",
+    "af": "Afrikaans",
     "az": "Azero",
     "bg": "Bulgaro",
     "cs": "Ceco",
     "tr": "Turco",
     "vi": "Vietnamita",
     "zhCN": "Cinese (Cina)"
-}
+}