Remove legacy 'ua' localization entry from index.html

Author: afurm

index.html

@@ -14,7 +14,6 @@
         "ru":    "ru",
         "tr":    "tr",
         "uk":    "uk",
-        "ua":    "uk",
         "zh-CN": "zh_cn",
         "zh-TW": "zh_tw"
       };