Multilingual Content Fixes

- Fixed parsing of locale string to use I18NUtil.parseLocale and not Locale constructor
 - Fixed type conversion of properties returned from MLPropertyInterceptor's directNodeService
 - Fixed handling of ALL_LANGUAGES filter selection
 - Fixed MultilingualContentService NPE when checking for duplicate locales


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5007 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/bean/UserPreferencesBean.java

@@ -99,7 +99,7 @@ public class UserPreferencesBean
    }
    
    /**
-    * @return current content filter language
+    * @return current content filter language, or <tt>null</tt> if all languages was selected
     */
    public String getContentFilterLanguage()
    {
@@ -116,7 +116,7 @@ public class UserPreferencesBean
               this.contentFilterLanguage = locale.toString();
           }
       }
-      return contentFilterLanguage;
+      return (contentFilterLanguage.equals(MSG_CONTENTALLLANGUAGES)) ? null : contentFilterLanguage;
    }
    
    /**