Update en-GB.com_flexicontent.ini

I thought this was a bug but being more specific that you need to change the display to 30 items or less would be infinitely more helpful. As even if you have only 10 items - it doesn't work if the column is set to 50.

![image](https://cloud.githubusercontent.com/assets/8617673/4859395/9138ada8-60e9-11e4-9e22-7bf48741f9be.png)