More consistent use of 'playlist' / 'play queue'
Simple mode library bugfixes. Fixes #565
Update spanish translation

Some minor changes
Merge pull request #566 from avuton/next

Service compartmentalization and incremental updating.
Merge pull request #568 from fdezInigo/patch-1

Update spanish translation
Merge pull request #567 from 8u/master

Simple mode library bugfixes. Fixes #565