Added Italian language (#233)

* Update i18n.ts

* Update de-DE.json

* Update en-US.json

* Update es.json

* Update fi.json

* Update fr-FR.json

* Update ru-RU.json

* Update zh-CN.json

* Create it-IT.json

* Update it-IT.json

* Update it-IT.json

* Update it-IT.json

* Update it-IT.json

* Update it-IT.json

* Prettier

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Co-authored-by: Sebastien Castiel <sebastien@castiel.me>

messages/ru-RU.json

@@ -300,7 +300,8 @@
     "es": "Español",
     "de-DE": "Deutsch",
     "zh-CN": "Chinese (Simplified)",
-    "ru-RU": "Русский"
+    "ru-RU": "Русский",
+    "it-IT": "Italiano"
   },
   "Share": {
     "title": "Поделиться",