feedEditDlg: Increase width to account for localised string lengths.

Before:

![screenshot - 01 10 2014 12_02_35](https://cloud.githubusercontent.com/assets/357054/4473501/b1e27a96-4953-11e4-9032-99fa436d5f2b.png)

After:

![screenshot - 01 10 2014 12_07_43](https://cloud.githubusercontent.com/assets/357054/4473509/bfcd4154-4953-11e4-8748-28f03b6db52f.png)