title: How to get a string from .properties file and use it in the same .properties file
body: <p>Is there a way to retrieve the value of a var in a .properties file and use is inside the same .properties file?</p>
  
  <p>Insted of this (where I have to write manually the words 'Main Menu' in every line)</p>
  
  <pre><code>mainMenuTitle = Main Menu
  NotBlank.menu.title = the field 'Main Menu' can't be null
  Size.menu.title = the field 'Main Menu' must contains 10 characters
  </code></pre>
  
  <p>I want something like this (where I get automatically the value of the var 'mainMenuTitle')</p>
  
  <pre><code>mainMenuTitle = Main Menu     
  NotBlank.menu.title = the field **mainMenuTitle** can't be null
  Size.menu.title = the field **mainMenuTitle** must contains 10 characters
  </code></pre>