I want to try translating this game into Thai language, but the game can't read Thai font

[NightCharm]

As a new game translator, I've attempted to edit the in-game text by modifying the .po file and translating it into Thai.
However, the text in the game now appears as *****************.
Is there anyways to make the game able to read Thai Font ?

Cheers! 

[GodIess]

There is no Thai font in the game, so you see ** instead of characters. As an alternative, add a font with these characters, but I don't know how to package this font so that the game displays it normally