Label text not visible on light backgrounds

Steps to reproduce

View an issue on a repo that has labels attached to the issue, where the background colour of the labels is some light colour

Expected

The text of the label is a dark enough colour to be visible

Actual

The text of the label is white so is hard to see.

changed the description

added Bug label

The code used in Gitlab to determine the label text color is (link):

  def text_color_for_bg(bg_color)
    if bg_color.length == 4
      r, g, b = bg_color[1, 4].scan(/./).map { |v| (v * 2).hex }
    else
      r, g, b = bg_color[1, 7].scan(/.{2}/).map(&:hex)
    end

    if (r + g + b) > 500
      '#333333'
    else
      '#FFFFFF'
    end
  end

closed via commit 3c8adffc