Setting data for &product; macro

- Right after the base-product repository is initialized, Installer sets the &product; macro, which is then used in helps
- bnc#886608
- Contains a little refactoring by moving some release notes handling to a separate function
- Tested in Installer
Yes, this is the default for release notes -> In fact it's an error and it's IMO there for the reason that testers will SEE and REPORT in UI this error. The other default is "SUSE Linux" as a safe default for help text in installer. They are not connected and should not be considered that way.