--- mozilla-esr17/browser/app/profile/firefox.js.lang	2012-11-19 19:41:56.000000000 +0400
+++ mozilla-esr17/browser/app/profile/firefox.js	2012-11-22 21:43:56.469434807 +0400
@@ -215,6 +215,9 @@ pref("keyword.URL", "");
 pref("general.useragent.locale", "@AB_CD@");
 pref("general.skins.selectedSkin", "classic/1.0");
 
+// Use LANG environment variable to choose locale
+pref("intl.locale.matchOS", true);
+
 pref("general.smoothScroll", true);
 #ifdef UNIX_BUT_NOT_MAC
 pref("general.autoScroll", false);