a0kribu, all these letters are already present and usable for a translation.
If you want to double-check the characters you'll need, the game fonts are :
The argument is that such letters are already barely legible in the smallest font, so reducing this font's size is completely out of question.
(edit: I hot-linked the image from the main source repository, so the images will update when new characters are added. Future-proof post
)