diff -up Zend/I18n/Translator/Loader/Gettext.php.glpi Zend/I18n/Translator/Loader/Gettext.php
--- library/Zend/I18n/Translator/Loader/Gettext.php.glpi	2013-10-02 09:41:18.572098028 +0200
+++ library/Zend/I18n/Translator/Loader/Gettext.php	2013-10-02 09:41:56.658244928 +0200
@@ -126,9 +126,11 @@ class Gettext implements FileLoaderInter
 
                     array_shift($originalString);
 
-                    foreach ($originalString as $string) {
-                        $textDomain[$string] = '';
-                    }
+/// PROBLEM WITH GLPI WHEN singular = plural                    
+/// opened bug http://framework.zend.com/issues/browse/ZF-11974
+//                    foreach ($originalString as $string) {
+//                        $textDomain[$string] = '';
+//                    }
                 } else {
                     $textDomain[$originalString[0]] = $translationString[0];
                 }
diff -up Zend/I18n/Translator/Translator.php.glpi Zend/I18n/Translator/Translator.php
--- library/Zend/I18n/Translator/Translator.php.glpi	2013-10-02 09:32:05.331918805 +0200
+++ library/Zend/I18n/Translator/Translator.php	2013-10-02 09:32:42.679067978 +0200
@@ -403,6 +403,11 @@ class Translator
             return ($number == 1 ? $singular : $plural);
         }
 
+        /// GLPI Hack for languages with 1 plural form (chinese)
+        if (!is_array($translation)) {
+            return $translation;
+        }
+
         $index = $this->messages[$textDomain][$locale]
                       ->getPluralRule()
                       ->evaluate($number);