How do you change the language of the text? I install with the right language twice but it still installed in a unreadable texts. Anyone got a idea?

Unless I'm mistaken, after changing the language setting in LW, you must then close & re-open LW for it to take effect. Of course the language settings are under View menu in LW. If you've successfully changed language, try it out on another program if you continue having problems. Try a text doc or another app you know has other language options. You also might need to reboot before you can utilise a newly installed language (I don't know.)