Why didn't you add languages like catalan, faroese or Romansh? They have their fair share of speakers.
Also, isn't it "ukrainian", "belarusian" and "Gujarati" rather than ukranian, belorussian and Gujurati?
There are a few spelling errors or inconsistencies: please accept Balochi instead of Baluchi and Gujarati instead of Gujurati. Also, check the spelling of Ukrainian. Use Slovene instead of Slovenian. For Romance languages, you could also include Catalan and Galician, and various Italian languages like Sicilian, Sardinian and Neapolitan which are different enough from standard Italian to be distinct. For Germanic languages you could also include Frisian, Low Saxon, and Alemannic. Many quizzes also include Scots (English not the Celtic language) as a separate Germanic language. Dutch and Flemish are the same standard language, so just keep Dutch, but West Flemish is distinct enough to be separate. A few more Indic languages could also be included; Saraiki, Marwari, Bhojpuri. For Celtic languages, you could also include Manx and Cornish.