TSC helps you to find bugs in the source and in the translation of FET, TiTiTo and StElTo. But you can also search for bugs in other Qt applications and software that uses .ts or .po files.
If you want to see how it looks like, just download and test it or have a look at this video:
https://www.youtube.com/watch?v=Qkj6yR5F2-k