Merge branch '3.4' into 4.0

* 3.4:
  fixed UUID error message id in translation files
  Add several missing translations of the UUID validation message.
  Serbo-Croatian has Serbian plural rule
  [Validator] Add missing UUID validator message translation (hu)
  [Validator] Add missing UUID validator message translation (en)
  add missing translation for uuid validator
  Fix false-positive deprecation notices for TranslationLoader and WriteCheckSessionHandler
  Fix PHPDoc return type
  [MonologBridge] Improve FirePHPHandler
  Fix SVGs not scaling in IE9, IE10, and IE11

Author: fabpot

PluralizationRules.php

@@ -144,6 +144,7 @@ public static function get($number, $locale)
             case 'bs':
             case 'hr':
             case 'ru':
+            case 'sh':
             case 'sr':
             case 'uk':
                 return ((1 == $number % 10) && (11 != $number % 100)) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);