Add support for `Aceh`

Aceh (ISO-639-3: ace) is a language from Sumatra, with roughly
3 million speakers.

More information: http://www.ohchr.org/EN/UDHR/Pages/
  Language.aspx?LangID=atj.
Add support for `Dangme`

Dangme (ISO-639-3: ada) is a language from Ghana, with roughly
1 million speakers.

More information: http://www.ohchr.org/EN/UDHR/Pages/
  Language.aspx?LangID=gac1.
Add support for `Assyrian Neo-Aramaic`

Assyrian (ISO-639-3: aii) is a language historically from Iraq,
North-Eastern Turkey and Iran, with roughly
between 700 thousand and 1 million, speakers.

Assyrian uses a custom script: Syriac.

More information: http://www.ohchr.org/EN/UDHR/Pages/
  Language.aspx?LangID=aii.