That’s embed.replies, but it looks like this is a language where that string wasn’t translated on Transifex the last time we updated the translations in core. And then you run into the following bug:
You see only the one and other key, but I guess your language usually has a lot more or different keys. That’s why overriding doesn’t work.
Please make sure that the strings you want to customize are actually translated on Transifex. That way everyone will get the translations the next time we update them and you will be able to override them in the admin section.