Ukrainian language code from l10n file name has been fixed:

"ua" — is country code for Ukraine.
"uk" — is code for Ukrainian language.
http://en.wikipedia.org/wiki/Ukrainian_language
http://en.wikipedia.org/wiki/Ukraine

component.json

@@ -52,7 +52,7 @@
     "select2_locale_sv.js",
     "select2_locale_th.js",
     "select2_locale_tr.js",
-    "select2_locale_ua.js",
+    "select2_locale_uk.js",
     "select2_locale_vi.js",
     "select2_locale_zh-CN.js",
     "select2_locale_zh-TW.js"