Fix UTF-8 characters in language names.

The language names had escaped UTF-8 characters in the YAML file, but became garbled when loaded in:

    1.9.3p0 :013 > vo = LanguageList::LanguageInfo.find('vo')
     => vol (vo) - VolapÃ¼k

I fixed the YAML file to just include unescaped UTF-8 characters.

I also fixed a typo in the gemspec.