Fix EZP-20316: long attribute desc overflow in Internet Explorer

# Description

![before](https://f.cloud.github.com/assets/305563/191435/dbcc23ea-7f36-11e2-9134-495a87de412c.png)

# Tests

Manual tests in IE 6, 7, 8, 9, Firefox and Chrome.

![after](https://f.cloud.github.com/assets/305563/191434/dbd1a586-7f36-11e2-8e84-b76c974c99d8.png)