[FE Awakening] Add characters to the font

Hi all.

I’m working on localizing the FE Awakening to Vietnamese. Everything is fine but the font.

The game uses bfnt font packed with png in a .lz file. I used FEAT tool to extract the .lz file and got the fonts but don’t know how to add more unicode characters.

So any good soul here can lend me a hand? Thanks in advance!!