Show Journal accelerator in palette.

This patch add the Journal accelerator (F5) to JournalPalette
you can disable the accelerator adding False/True to the definition.

Fixes #3185
![captura de pantalla 2014-12-18 a la s 20 35 19](https://cloud.githubusercontent.com/assets/2650479/5497120/6848d062-86f5-11e4-8294-99353ccc4da7.png)

Yes, the accel should be visible always, please send a new pr, this is a fix we can include.