Merge pull request #10 from vmoravec/add-slp-service-dialog

Add slp service dialog for registration FATE#316384
make the credentials input fields wider (bnc#864882)
ask user to confirm skipping the registration
use the current language in "Accept-Language" HTTP header
added textdomain to discover_registration_services.rb

to properly extract translatable strings by y2makepot
reformat translatable popup text
changes

- 3.1.9
Merge pull request #16 from yast/ui_fixes

UI fixes
better error handling

- 3.1.10
Merge pull request #17 from yast/error_handling

better error handling
Check for defined client class to avoid warnings