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Rename "discussions" to "threads"

internal customer since GitLabbers now are using threaded conversations.

From https://gitlab.com/gitlab-org/gitlab-ce/issues/32451#note_115719349

Can we just use the same terms as slack? Start a thread is much clearer than something something Discussion. It's not immediately obvious to a new user what a 'discussion' means in GitLab terms. Thread is clear though.

This is a very good point. To existing users of GitLab, especially those that use merge requests frequently, "discussion" should be clear because its very much part of the MR commenting UI. For issues right now, this is not common and so for users who only use issues (and not MRs) and for new users, "thread" would be a nice term.

cc @victorwu

Edited Mar 19, 2019 by Victor Wu