Impossible to control contrast of the panel headers on Flamingo

While editing a color theme, I cannot control the color of the text of the panel headers, while I can change the background color (@panel-bg). The color of the text is always a grey ( #4D5860 ). This actually limits a little the backgrounds that can be chosen for the panels, because a good contrast with this uncontrollable grey needs to be preserved (e.g. having panels with white text on dark grey background poses a problem because the title of the panel will be almost unreadable).

Solutions can be:

• allowing this color to be controlled
  • allowing to control, with it, the background color of the panel title, could also be interesting (as it used to be in colibri skin) - but this would need to be a new issue
• automatically using a color for the panel title which is a copy of the other colors of the panels (or of the wiki), for which contrast can be controlled (e.g. panel-default-text or link-color).