update serbian translation, we now have two, latin and cyrillic (Branko Kokanovic)

program/localization/index.inc

@@ -62,7 +62,8 @@
 	'se'    => 'Svenska',
 	'si'    => 'Slovenian',
 	'sk'    => 'Slovak',
-	'sr'    => 'Serbian',
+	'sr_latin'    => 'Serbian Latin',
+    'sr_cyrillic'    => 'Serbian Cyrillic',
 	'tr'    => 'Turkish',
 	'th'    => 'Thai',
 	'vn'    => 'Vietnamese'

program/localization/sr_latin/labels.inc

@@ -3,7 +3,7 @@
 /*
 
  +-----------------------------------------------------------------------+
- | language/sr/labels.inc                                                |
+ | language/sr_latin/labels.inc                                          |
  |                                                                       |
  | Language file of the RoundCube Webmail client                         |
  | Copyright (C) 2005-2007, RoundCube Dev. - Switzerland                 |

program/localization/sr_latin/messages.inc

@@ -3,7 +3,7 @@
 /*
 
  +-----------------------------------------------------------------------+
- | language/sr/messages.inc                                              |
+ | language/sr_latin/messages.inc                                        |
  |                                                                       |
  | Language file of the RoundCube Webmail client                         |
  | Copyright (C) 2005-2007, RoundCube Dev. - Switzerland                 |