Remove unused strings

(cherry picked from commit e3be6130550f56f17994935bb55b644da7799393)
Core: NL translation

Change-Id: Ie17b873421d88ca79c73a87b78c25e8346352f30
(cherry picked from commit f355f9fc98725d864c3a8ffdb9502d72aa701029)
Added sahlnaskh arabic font to Android.mk & fonts.mk files to actually get the font installed

Change-Id: If99e370f9d37ce1838bdcf10e895a9d0908d9176
(cherry picked from commit fb8bdca579dc70af9eb48656b185dcb6556cb1cb)
core: fix volume panel more button transparency

Change-Id: I9f728256efbaf138611822079ea7737cd345bb19
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
(cherry picked from commit 2f290bef71c69d7bc2736451faa10de175b31a32)