Balabolka does not contain voices. The voices are the separate software created by companies like "Acapela Group", "IVONA", "Nuance", "Cepstral", etc. The Balabolka's web-page contains links to their servers. I recommend you to try "IVONA" and "Nuance" voices distributed by HarpoSoftware.com vendor.
Also, Windows 10 allows to download and install "language packs" for different languages. A language pack contains one or two voices. You can download a language pack from the official Microsoft server.