Properties: thanks, fixed in next build - now shows sprite's properties.
The "�" character: I can reproduce, but it's an encoding issue with the javascript file, not a bug in Construct 2. All you need to do is save the javascript file in UTF-8 (by default they are ANSI). In Notepad you just go file -> save as and set "encoding" to UTF-8. In Notepad++ you can just select the menu option encoding -> convert to UTF-8. Then you can use special characters as you please, it works fine.