Ticket 4686 fixed.

Truncated details about activity is shown in palette, if set.
Bug's here : http://bugs.sugarlabs.org/ticket/4686

### Screenshots:
![palette_short](https://f.cloud.github.com/assets/2565248/2148787/4afd8b4a-93eb-11e3-8b79-1a20468fdf2e.png)
![palette_long](https://f.cloud.github.com/assets/2565248/2148790/51e2a5b2-93eb-11e3-8817-40fc099efb8a.png)