Internationalisation of javascript/m* directories
What does this MR do?
i18n the javascript/m* directories
This is one of many MRs opened in order to improve the overall internationalisation of the GitLab codebase.
https://docs.gitlab.com/ee/development/i18n/externalization.html
Related issue is https://gitlab.com/gitlab-org/gitlab-ce/issues/59733