In which context do you use the stressed bʌt and when do you use the unstressed bət? How often is that?
If you know about the website www.forvo.com, I think it's a shortcoming that speakers use only one of the two versions. 


Question: IPython Qt Console doesn't have a title in GNOME app switcher
Answer: This has never happened to me but this is more a "menu" issue than an application one.

As a starting point I suggest you navigate to the file 

~/.config/menus/gnome-application.menu


See if its listed there and if there are any issues with the listing.

There is also an app called "menulibre" which allows you to add/modify icon names. It available in the AUR.