i18n boards store directory
What does this MR do?
i18n of the boards store directory
This is one of many MRs opened in order to improve the overall internationalisation of the GitLab codebase.
This MR only targets the Vanilla JS files.
https://docs.gitlab.com/ee/development/i18n/externalization.html
Related issue is https://gitlab.com/gitlab-org/gitlab-ce/issues/59733