This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

expand remaining non-explicit eslint-disable blocks and factor out globals when no-undef encountered

Removed props on main VueJS app instead uses data variables

Clicking label adds that label to the filtered by