Log Message:
Update to 0.139:

0.139 "Sexual Chocolate"
* std::logic_error thrown ("basic_string::_S_construct null not valid")
  (Heinrich Müller, #678445)
* added error popup for posting to a disabled server (max connections 0)
  (Heinrich Müller)
* Patches to SSL socket handling (Steve Davies)
* clear last-visited (group/article) on middle-click (Heinrich Müller)
* Updated translations: Spanish (Daniel Mustieles), Slovenian (Martin Srebotnjak,
  Andrej Žnidaršič, Matej Urbančič).