Improve UI strings (minor)
Improve UI strings (minor)

jessamynsmith/fontbakery,vitalyvolkov/fontbakery,davelab6/fontbakery,vitalyvolkov/fontbakery,vitalyvolkov/fontbakery,moyogo/fontbakery,graphicore/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,graphicore/fontbakery,moyogo/fontbakery