Change the label 'Notes' to 'Observations'

It is possible to user to confound the label 'Notes' with 'Fiscal Notes'.
So, Change the label 'Notes' to 'Observations' to avoid this kind of
misunderstanding.

Change-Id: I5b7878c2ad0d60b9bd5ddd6aa375782c53ef55c6
fixes: http://bugs.async.com.br/show_bug.cgi?id=5517
Merge "Change the label 'Notes' to 'Observations'"