Is Kobo Start Menu open-source?

I am using Kobo Start Menu 8 for my Kobo Aura HD. The only issue I am facing is, I cannot type punctuation marks. Though I can change my WIFI password, there is no guarantee all WIFI passwords are English characters. So I am looking for Kobo Start Menu source code to do some tiny modification to support more characters for inputting. But I do not find any threads related to Kobo Start Menu source code, so is it possible?

Thank you.