Make sure that resource_label_event.epic_id exists

Closes #7705

See merge request gitlab-org/gitlab-ee!7460

[QA] Improve internals of hashed storage settings-related files

Closes #7763

See merge request gitlab-org/gitlab-ee!7508

Show the commit-sha for pre-release versions

See merge request gitlab-org/gitlab-ee!7726

The pre-release tags are set at the beginning of a release, so it
would be impossible to figure out which version was running if we're
running nightlies.

In that case it's better to still link to the SHA. These versions
don't get deployed to .com.

New Crowdin translations

See merge request gitlab-org/gitlab-ee!7492

Add Manage licenses to MR widget and pipelines

Closes #7120

See merge request gitlab-org/gitlab-ee!7411

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This was introduced by https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7371
for which no QA was run, even though QA files were changed.

This is a follow-up to
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7531.
Signed-off-by: Rémy Coutable <remy@rymai.me>

CE upstream - 2018-10-01 21:21 UTC

Closes #2702 and #2697

See merge request gitlab-org/gitlab-ee!7743

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