Add support for Polish language diacritics to ET Book font

[ochococo]

The font is great but outside English text it's almost useless.

Maybe we can find time and resources to add support for Polish diacritics? It's not that much work:

ĄĆĘŁŃÓŚŹŻ

and

ąćęłńóśźż

I can pay to add those 18 symbols 🙂

[ochococo]

@adamschwartz 🙏

[adamschwartz]

Hey @ochococo I would if I could, but my role in this project was merely in converting the original .suit files into .ttf etc. I would love to have these additions as well.

[ochococo]

@adamschwartz Do you know anybody who could do that as a contractor?

[adamschwartz]

I don’t directly, but @dpk (who made https://github.com/dpk/et-book) and @davelab6 (who is an expert on fonts and curator of fonts for Google Fonts) may have a better idea of where to get that help.

[igalic]

my attempt at dpk#2 (comment) using Fontforge's autofill feature was only mildly successful…

I'm also getting plenty of errors, when trying to actually save:

• missing Points at Extrema
• Non-integral coordinates

i suppose i can just generate it without validation, huh?