Translating Class names in FE7

Hi, folks!
I’m currently digging into translating FE7 into Russian (there were attempts, but we still don’t have a proper translation as far as I know).
One of the tasks - how to translate class names?
There is a font image in «Class names special font» patch. But how do I use it?
How can I modify it to add new letters and modify the ones that already there (as I see some letters are missing even for English)?