Add polish and russian

lang/languages.json

@@ -8,7 +8,9 @@
     "hy": "Armenian",
     "it": "Italian",
     "oc": "Occitan",
+    "pl": "Polish",
     "ptBR": "Portuguese (Brazil)",
+    "ru": "Russian",
     "sk": "Slovak",
     "sl": "Slovenian",
     "sv": "Swedish",