add cache setting
Revert "deactivate proximity_info"

This reverts commit 576c9ec92e960e92cfd7d16e1217eb5527110a45.

Conflicts:
	feincms/content/application/models.py
add cache key to extension
Revert "make "none" reverse cache language aware"

This reverts commit 6eb3e7eae497c6d958ef8a1b67dad0b8d93bf665.
This function is better fitted in the translation extension.
fix tests. Passing...