You can find the translation templates here. I am not sure if the 3.2.3 files still work with the current 3.5.3 client version. That’s a question @TS.ChrisR should be able to answer.
You certainly need to use a newer version of QT Linguist than mentioned in the readme. I personally have never used the program, but I’d probably try this: Release Qt Linguist 5.12.0 · lelegard/qtlinguist-installers · GitHub
