Make issue states in references translatable

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The following discussion from gitlab-ce!32277 should be addressed:

• @jprovaznik commented on a discussion: (+6 comments)

  If we dive into translating "moved" status, perhaps it would make sense to translate also other states then 🤔? For this we could use N_ method (https://docs.gitlab.com/ce/development/i18n/externalization.html#dynamic-translations), similar to https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/helpers/notifications_helper.rb#L43-48.