Use html for subscript text (instead of unicode)

Some tools in the chain do still not support Unicode.
Adapting inno setup script to current directory structure

Books are already and translations will be integrated in the
executable, do not need to be separately installed.
Update language list of InnoSetup script

Latest InnoSetup has a new list of languages.
Merge pull request #9 from aportale/master

Workaround for SubScript on Windows and InnoSetup adaptations