well, is your computer set to thai language or did you download the extra language package? I don't know. When that happens to me I just type the song in thai again.
the rename (title) display is in thai but i right click>property and then go to advance and then i type in the thai and i click apply and ok and when i open it again, it doesn't show up.
i did not install language package (but i bought my laptop in thailand) and it have thai language too...
i'm confused of what you are talking about, can you be more specific? what tag are you talking about? do you mean on anything, or are you talking about tags for like programing languages?