Removed duplicated before_filter

This is a little bit wired. You tell Rails to run it ONLY if... and give some excepts?

I removed this line and everything worked too for me.
Removed unneeded nil association

The nil association is unneeded doesn't it? I removed it without any doubt in my version.
Code cleanup

Removed unneeded if construct. Just call .first which will be faster than a condition.
Added missing german vote translation
Removed deprecated .find() :first and :all methods

This is deprecated in newer Rails versions.
Merge pull request #205 from CodeInsider/patch-1

Removed duplicated before_filter
Merge pull request #206 from CodeInsider/patch-2

Removed unneeded nil association
Merge pull request #207 from CodeInsider/patch-3

Code cleanup
Merge pull request #210 from CodeInsider/patch-5

Removed deprecated .find() :first and :all methods
Merge pull request #208 from CodeInsider/patch-4

Added missing german vote translation
add Daniel Felix as a contributor
Added project module translation (project -> settings)