add convert shortcuts
fix number conversion to use proper type
properly initialize FastGettext

- detect available locales
- join all text domains to a single combined text domain
- set the current language
- set the correct path to YaST translations
- support for dynamic language change at runtime
  (needed in installation)
Merge pull request #25 from lslezak/locale_fixes

Properly initialize FastGettext
for hash builtins same key order as in YCP
remove workaround for System namespace as it is fixed directly in WFM
fix sorting
fix sorting
fix deep copy to work everywhere
fix regression in path clonning