Fix font_size under windows

src/constants.h

@@ -100,7 +100,13 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 /*
     GUI related things
 */
-#define TTF_DEFAULT_FONT_SIZE   (14)
+
+// TODO: implement dpi-based scaling for windows and remove this hack
+#if defined(_WIN32)
+	#define TTF_DEFAULT_FONT_SIZE   (18)
+#else
+	#define TTF_DEFAULT_FONT_SIZE	(14)
+#endif
 #define DEFAULT_FONT_SIZE       (10)
 
 #endif