Although it's fine to incorporate strange spelling, fonts, colors or other things to your IC letters and posts; players should be aware that I am fairly certain no DM will ever read them if it's at all difficult to do so.
I think an ooc translation afterward would be nice. Same goes for transcription of tiny text in images.
Cant you just copy the text, and paste it elsewhere? For instance in the quick reply box? (just dont hit enter :)) Though I must say I personaly dont bother much with these posts myself.
I am a fond believer on writing things fairly normally and just describing the style before the actual letter or post. It just makes it easier to understand.
I get it. I'll post a translation into English.