Python-i18n: implement gettext functions in libcalamares.utils

- remove Job.gettextPath
 - add libcalamares.utils.gettext_path()
 - add libcalamares.utils.gettext_lang()
 - modify examples in main.py
 - add some gettext debug-output from dummypython
 - correct namespace mis-labeling
 - provide two forms of GlobalStorage
   - regular use, has a JobQueue with storage
   - testing use, creates GlobalStorage separately, provide
     independent access to that for Python.

src/libcalamares/PythonHelper.cpp

@@ -316,4 +316,4 @@ Helper::handleLastError()
 }
 
 
-} // namespace Calamares
+} // namespace CalamaresPython