Bug #696492: Change report name in menu or in report output to be consistent

Change the register name to "Accout Transaction Report" when the register
type is GENERAL_LEDGER, INCOME_LEDGER, or default in function gnc_reg_get_name().

Patch by Carsten Rinke.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23131 57a11ea4-9604-0410-9ed3-97b8803252fd