Improve NL translation

Rename 'Achtergronden' to 'Achtergrond', this fits nicer. One line in stead of two.

Change-Id: If872dd9a19b636645c18a94ddd4a5a6df6bd78c1
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0
Merge pull request #4 from androidarmv6/cm-11.0

1