Add missing translations from GitLab UI

Summary

app/assets/javascripts/commons/gitlab_ui.js misses several generic translations such as:

• GlBanner.closeButtonTitle
• GlBreadcrumb.showMoreLabel
• GlAlert.closeButtonTitle

Identify these translations and include them in the runtime config.

More context

The following discussion from gitlab-ui!4567 (merged) should be addressed:

• @vanessaotto started a discussion: (+3 comments)

  Hi @svedova, I found a couple of plain english text in gitlab/ui in relation to the CloseButton component. I don't know exactly how translations work in gitlab/ui, but copied what I saw in other components. Am I doing it right? :)