update for release 0.22

- updated (all) po files for release 0.22
- update (all).mo files with po-compile.sh tools to /share/locale
- update CHANGELOG file for release 0.22
- update README for Portuguese translator
- update spec file for release 0.22
- update po-update.sh script for release 0.22
- update isodumper.glade file for Portuguese translator
- minor cosmetic change on isodumper.py file