Parse strings and float in the same locale in which they were serializwd.

src/common/Variant.hxx

@@ -57,8 +57,20 @@ class Variant
     // Conversion methods
     const string& toString() const { return data;                          }
     const char* const toCString() const { return data.c_str();             }
-    const Int32 toInt() const      { return atoi(data.c_str());            }
-    const float toFloat() const    { return float(atof(data.c_str()));     }
+    const Int32 toInt() const      {
+      istringstream ss(data);
+      Int32 parsed;
+      ss >> parsed;
+
+      return parsed;
+    }
+    const float toFloat() const    {
+      istringstream ss(data);
+      float parsed;
+      ss >> parsed;
+
+      return parsed;
+    }
     const bool toBool() const      { return data == "1" || data == "true"; }
     const GUI::Size toSize() const { return GUI::Size(data);               }