title: Can't change default error messages in CakePHP 2.3
body: <p>In my CakePHP project, I want to display error messages but it's not working.</p>
  
  <p>When I'm submitting, I want it to display an error message like: "This field is required", but by default it's showing "Please fill out this field". I changed the message, but it's not changing from the core.</p>
  
  <p>My View, Model, and Controller codes are as following:</p>
  
  <p><code>add_district.ctp</code>:</p>
  
  <pre><code>        &lt;div class="pg_title txtLeft"&gt;Add District&lt;/div&gt;
  
                 &lt;?php echo $this-&gt;Form-&gt;create('Admins', array('action' =&gt; 'add_district'));?&gt;
                  &lt;table&gt;
                      &lt;tbody&gt;
  
                          &lt;tr&gt;
                              &lt;td&gt;&lt;label&gt;District Name&lt;span class="red required"&gt;*&lt;/span&gt;&lt;/label&gt;&lt;/td&gt;
                              &lt;td&gt;&lt;?php echo $this-&gt;Form-&gt;input('District.district_name',array('label'=&gt;false,'div'=&gt;false,'size'=&gt;50,'style'=&gt;'width:330px;')); ?&gt;&lt;/td&gt;
                          &lt;/tr&gt;
  
                          &lt;tr&gt;
                              &lt;td colspan="2" align="right" style="padding-right: 113px;"&gt;&lt;input type="reset" value="Reset"&gt; | &lt;?php echo $this-&gt;Form-&gt;submit('ADD', array('div' =&gt; false));?&gt;&lt;/td&gt;
                          &lt;/tr&gt;
                      &lt;/tbody&gt;
                  &lt;/table&gt;  
              &lt;?php print $this-&gt;Form-&gt;end();?&gt;   
  
  &lt;div class="clear"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>Model : <code>District.php</code></p>
  
  <pre><code>&lt;?php
  App::uses('AppModel', 'Model');
  /**
   * Admin Login Model
   *
   */
   class District extends AppModel
   {
      public $name='District';
      public $usetables='districts';
  
       public $validate = array(
       'district_name' =&gt; array(
                       'rule' =&gt; 'notEmpty',
                       'allowEmpty' =&gt; false,
                       'message' =&gt; 'This field is required'));
  
   }
  ?&gt;
  </code></pre>
  
  <p>And my controller Code is (<code>AdminController.php</code>):</p>
  
  <pre><code>public function add_district()
          {
  
              $this-&gt;layout='common';
              $this-&gt;District-&gt;create();
              $this-&gt;District-&gt;set($this-&gt;data);
            if(empty($this-&gt;data) == false)
              {
                      if($this-&gt;District-&gt;save($this-&gt;data))
                      {
                          $this-&gt;Session-&gt;setFlash('District Added Successfully.');
                          $this-&gt;redirect('add_district');
                      }
  
              }
              else
              {
                  $this-&gt;set('errors', $this-&gt;District-&gt;invalidFields());     
              }
          }
  </code></pre>