update german translation
Latest labels in Finnish
Add zh_CN translation.
Merge pull request #191 from rthome/master

Update German translation
Merge pull request #192 from JKakku/patch-1

Latest labels in Finnish
Merge pull request #195 from yxd-works/zh-translation

Add zh_CN translation.
use guava for lock handling
queue size in metrics
allow proxy configuration out of the box (fix #196)
use weak references for lock keys
wait for lock for one minute, then timeout
first resolve absolute url then truncate
better log message
requeue feed immediatly if an entry fails to update
add more locks to the pool
set lang header
missing =
display log error when lock fails
feeds with http errors now bypass update queue