Simple wrapper to easily use different message sources in Yii

Y18n.php

<?php
class Y18n
{

    /**
     * Wrapper for Yii::t() for static messages
     */
    public static function st($category, $message, $params = array(), $source = null, $language = null)
    {
        $source = 'staticMessages';
        return Yii::t($category, $message, $params, $source, $language);
    }

    /**
     * Wrapper for Yii::t() for editable messages
     */
    public static function et($category, $message, $params = array(), $source = null, $language = null)
    {
        $source = 'editableMessages';
        return Yii::t($category, $message, $params, $source, $language);
    }

    /**
     * Wrapper for Yii::t() for attribute messages
     */
    public static function at($category, $message, $params = array(), $source = null, $language = null)
    {
        $source = 'attributeMessages';
        return Yii::t($category, $message, $params, $source, $language);
    }

}