extra_english.lang file not working

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I'm unclear as to what the game can display now, because it can display most (not all) Unicode 1.0 characters, and some (not all) Unicode 1.1 characters, and an unknown amount of 2 byte UTF-8 characters. At least I know that it can display "Å" under the right conditions. It's all very fuzzy.

Not all fonts support all possible Unicode characters (though i'm not sure if there is one that does). In order to determine if there is a lack of Unicode support based simply on what is rendered on the screen, you have to see if the font (or FNT) used supports the characters itself.