Hello and welcome to the forums bestiarii - thanks for joining!
I don't have your phone, but have had a quick look for you and found the following:
The only way to turn off the shutter sound with your Huawei Ascend 2, is to download a 3rd party software called Peek-A-Boo. It is free to use and works
It is worth noting that, in some parts of the world, it is a legal requirement that there is a shutter sound on the camera