Add Ukrainian locale (uk-UA)

Major Ukrainian typeface designers claimed that would translate book to Ukrainian lang:

• https://facebook.com/groups/1865901153686620?view=permalink&id=2204997133110352
  • https://facebook.com/andrij.shevchenko/posts/1902869263082273

Also, there is Ukrainian translating project on Wikisource

• https://uk.wikisource.org/wiki/%D0%9F%D0%B5%D1%80%D0%B5%D0%BA%D0%BB%D0%B0%D0%B4:%D0%94%D0%B8%D0%B7%D0%B0%D0%B9%D0%BD_%D0%B7_FontForge

TODO

Add uk-UA sub-folder for Ukrainian locale

• https://github.com/fontforge/designwithfontforge.com/tree/gh-pages/uk-UA