Typo Fix in Italian locale, update Romansh locale (#1121)

Author: msom

arrow/locales.py

@@ -425,7 +425,7 @@ class ItalianLocale(Locale):
         "hours": "{0} ore",
         "day": "un giorno",
         "days": "{0} giorni",
-        "week": "una settimana,",
+        "week": "una settimana",
         "weeks": "{0} settimane",
         "month": "un mese",
         "months": "{0} mesi",
@@ -4139,6 +4139,8 @@ class RomanshLocale(Locale):
         "hours": "{0} ura",
         "day": "in di",
         "days": "{0} dis",
+        "week": "in'emna",
+        "weeks": "{0} emnas",
         "month": "in mais",
         "months": "{0} mais",
         "year": "in onn",