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Please try to add the phrase key with a backslash (\) like this:
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Also please don't forget to delete phrase caches (Dashboard > Forums > Dashboard admin page) before checking.
Thanks for your last answer, but this does not work either (phrases cache deleted). Also, this phrase is not in the wpforo-*.po file.
So, how can we fix this please?
You've added wrong slash. The correct is "\" not "/". Please remove it. And create one with this key:
This topic doesn\'t exist or you don\'t have permissions to see that.
Also try using Loco Translate plugin
Sorry, I updated my post. The correct is this "\".