Add custom additional text to emails

Closes #4474

See merge request gitlab-org/gitlab-ee!5031

Update Geo nodes layout for better usability

Closes #5146

See merge request gitlab-org/gitlab-ee!5199

New Crowdin translations

See merge request gitlab-org/gitlab-ee!5241

CE upstream - 2018-04-05 05:20 UTC

See merge request gitlab-org/gitlab-ee!5240

EE-PORT Fix 404 in group boards when moving issue between lists

See merge request gitlab-org/gitlab-ee!5217

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/4474

Update issue_board.md to fix one occurrence of the Gitlab edition for multiple issue board feature

See merge request gitlab-org/gitlab-ee!5189

Signed-off-by: Rémy Coutable <remy@rymai.me>

[Rails5] Add rails5  jobs to gitlab-ci.yml

See merge request gitlab-org/gitlab-ee!5236

# Conflicts:
#	locale/gitlab.pot

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