I'm afraid setFontCustom won't take vector fonts, but I guess you might be able to knock some font drawing up yourself.
However, the docs are actually out of date. The new Vector font you're using was specifically designed to contain many international characters. See the map of characters below...
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I'm afraid setFontCustom won't take vector fonts, but I guess you might be able to knock some font drawing up yourself.
However, the docs are actually out of date. The new Vector font you're using was specifically designed to contain many international characters. See the map of characters below...
The font contains the ISO8859-1 codepage (https://en.wikipedia.org/wiki/ISO/IEC_8859-1#Code_page_layout) so hopefully it'll do most european languages
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