title: Not able to add Item having '-' in name to Sitecore
body: <p>I'm trying to add a language in system=>languages which have name nl-Nl
  But Sitecore alerting an error</p>
  
  <pre><code>An item name cannot contain any of the following characters:
  \/:?"&lt;&gt;|[]- (controlled by the setting InvalidItemNameChars)
  </code></pre>
  
  <p>My web.config file have</p>
  
  <pre><code>&lt;!--  INVALID CHARS
              Characters that are invalid in an item name
        --&gt;
        &lt;setting name="InvalidItemNameChars" value="\/:?&amp;quot;&amp;lt;&amp;gt;|[]" /&gt;
        &lt;!--  ITEM NAME VALIDATION
              Regular expression for validating item names
        --&gt;
        &lt;setting name="ItemNameValidation" value="^[\w\*\$][\w\s\-\$]*(\(\d{1,}\)){0,1}$" /&gt;
  </code></pre>
  
  <p>This same thing I can do in another Sitecore without any error</p>
  
  <p>My sitecore version is: Sitecore.NET 7.2 (rev. 140526)</p>