When i select to “Turkish” language, a character problem occured. For example the menu items are must be " Spark- Bağlantılar-Eylemler-Yardım" and “Online” is must be “Çevrimiçi”
“Idle” is must be “Hemen dönecek”, “Connections” is must be “Bağlantılar”.
I don’t know then. Shows fine for me on Windows 7 Ultimate (EN). Maybe there is something with the fonts on your system. Or maybe something wrong with regional settings.
Btw, are you using the full installer of Spark? Not the online one?