function getCurrentLatin() {
  if (useFira) {
    const firaWeight = $('#fira-weight-select').val();
    const firaWidth = $('#fira-width-select').val();
    const index = parseInt(firaWeight) * 3 + parseInt(firaWidth);
    return res.firaSamples[index];
  } else {
    const ralewayWeight = $('#raleway-weight-select').val();
    const index = parseInt(ralewayWeight);
    return res.ralewaySamples[index];
  }
}
Get current fira glyphs
@returns {{[key: string]: { advanceWidth: number, contours: GlyphData }}}