UX: More upbeat message when topic list is empty (PR #10740)

This message used to say “There are no topics here. That’s sad.” Now it is a much happier message.

Annotation 2020-09-24 085727

I added canCreateTopicOnCategory for /latest route as well.

GitHub

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https://meta.discourse.org/t/change-there-are-no-latest-topics-thats-sad-to-a-less-depressing-message/162268/26