In the review queue I just stumbled upon a question about a translator app for Ubuntu , which is on the way to be closed as "off topic".
Is closing and pointing to https://softwarerecs.stackexchange.com/ really the way we should go?
As long the question is not asking for "the best", I would say it is on topic here. OP just asks for "a" translator of a certain type for Ubuntu, which is a question about (using)... Ubuntu I would say.
The Help Centre also seems to leave no doubt the question is on- topic:
Questions that you may ask:
Running third-party applications on Ubuntu.
There are many questions here that might generate a better answer somewhere else, but there will be always an overlap of topics, and the decision where to ask is OP's.