Make pages translatable

Hi! I added a feature that makes it possible to translate individual pages. I did this because I needed to have pages in different languages but wasn't completely happy with how Comfy is handling this via the mirroring feature right now.

Here are some screenshots
![screenshot](http://f.cl.ly/items/04023G1A072V0L2x1E3o/Bildschirmfoto%202014-09-10%20um%2019.25.35.png)
![screenshot](http://f.cl.ly/items/2M21132m2r0p192J0x3v/Bildschirmfoto%202014-09-10%20um%2019.25.57.png)
![screenshot](http://f.cl.ly/items/0n0O462K3v0k0N2V3U2L/Bildschirmfoto%202014-09-10%20um%2019.27.38.png)
![screenshot](http://f.cl.ly/items/3v1y283X2J3G0N11453R/Bildschirmfoto%202014-09-10%20um%2019.27.57.png)

Hope you like it.