I wish there was a way to easily flag links to translations as being questionable. That would cover the case where a linked translation is correct as a sentence, but does not mean the same as the original sentence.
Of course one could go and write a comment on each questionable translation, but it is quite tedious, and it is easy to get sidetracked in the process. Or, as an advanced contributor, one could simply unlink the offending translations, but then nobody would probably notice.
I have seen the "unlink" tag, but I don't think a tag is enough.
See sentence #807032 for a current example.
What I normally do is the following.
I take notice who was the one to create the link. for example, #1508983 was linked by marcelostockle - you can see that in the logs. In this case it's a relatively simple case, he added his sentence as a translation. So I comment under his sentence asking him to verify his translation.
Sometimes it's more complicated than that. Sentence A and sentence B were added independently, and then someone linked them. In this case I comment under any of those tagging the person who linked them and asking them to verify the link.
I do something similar, but it is rather difficult to keep track of the sentences I have remarked on in this way. At least there is a page with all my sentence reviews, but no such thing for my translation review.
I wish some of this could be automated somehow, with notifications going out to those involved.
Thanks for sharing your thoughts on this. I completely agree with you that we could streamline the process of dealing with non-matching translations a lot better. While I have some ideas on what we can do, I can say that designing a good feature for this will not be an easy feat.
In any case, I have created an issue on GitHub: