I'm using Linux Mint 16 and I got a problem.
I installed Qt Creator 5.2.1 from binary package, downloaded from Qt site. I don't have Qt Linguist... Also, I have installed qtcreator and qt5-dev-tools (or similar name) from repository, still no Linguist. Where I can download it?
I prefer binary version from Qt site because it's newer than version from repository.
It should be in the bin folder. You can always do this to figure it out:
find $installdir/ -name \*linguist\*
By the way, there is also another option: install Archlinux and get all the fancy latest stuff. ;-)