title: How to limit users to ONLY input one specific language in a Text Field?
body: <p>So I'm having this Text Field that users can input anything based on the languages installed on their keyboard. I'm asked to limit them to only use Arabic. The example is like this: <a href="http://epay.sanjesh.org/Payment/Customer.aspx?id=WcAGgjZVzEk=" rel="nofollow">http://epay.sanjesh.org/Payment/Customer.aspx?id=WcAGgjZVzEk=</a></p>
  
  <p>In that link, you are only allowed to input Arabic language. Even if your keyboard language is set on English, it still writes Arabic.
  I was thinking of using lang="ar". 
  Is that correct? if it is, then how should I use it?!</p>