In translations view Icon empty button always appears

 see: https://github.com/joomla-projects/com_localise/issues/64

we will now get the icon only when necessary, for example:
![screen shot 2014-06-17 at 18 11 24](https://cloud.githubusercontent.com/assets/869724/3302996/2b6cb68c-f63a-11e3-9f45-5e97fc4940e8.png)

Also some code style in this PR