Revert "Added sahlnaskh arabic font and give it higher precedence than DroidNaskh"

This reverts commit aea94c1a973cb7113bb933d3765e7896bcb6e1cb.

Change-Id: Ifb42e403af60cc58cff09e07ecb110bb9939e8ab
Core: add ES translations thanks to @SensesXda
SystemUI: update ES translations thanks to @SensesXda