When the NLS accessor class and the resource file are in the same
package, use the package name retrieved from the class to reference the
resource file (in the BUNDLE_NAME constant)

Change-Id: Ifee6ab2781826e3458da70c4fc9482d5c9a7d72b
Signed-off-by: Alexandra Buzila <abuzila@eclipsesource.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/183646
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Tested-by: Jeff Johnston <jjohnstn@redhat.com>
Reviewed-by: Jeff Johnston <jjohnstn@redhat.com>