new check: There must not be VTT Talk sources in the font.
new check: There must not be VTT Talk sources in the font.

(issue #2059)

moyogo/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,moyogo/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,graphicore/fontbakery,graphicore/fontbakery