release 3.1.1

* translation update
* fix broken build with gcc (#87). The issue was reproduced only with
  gcc build and has been resolved by just replacing C-like `isnan` to
  `std::isnan`

sources/awesomewidgets/graphicalitemhelper.cpp

@@ -164,7 +164,7 @@ float GraphicalItemHelper::getPercents(const float &value, const float &min,
 {
     qCDebug(LOG_LIB) << "Get percent value from" << value;
     // newest Qt crashes here if value is nan
-    if (isnan(value))
+    if (std::isnan(value))
         return 0.0;
 
     return (value - min) / (max - min);