It seems I can reach Kobo guys from here. You recently entered Turkish market, that is great. But you have one very important missing feature. There is no turkish hyphenation. Turkish is a language with extensive agglutination, so hyphenation is very important.
I have made a hyphenation dictionary, it works in Kobo too. I have been sharing it here and on Turkish forums. It is all in GPL. I hope you can use it in future firmwares too:
https://github.com/Slyneth/hunspell-hyphenation-turkish