Use more consistent terminology in projects admin UI

app/views/admin/projects/show.html.haml

...stration/geo/disaster_recovery/background_verification.md

..._recovery/img/checksum-differences-admin-project-page.png

doc/administration/gitaly/praefect.md

doc/administration/repository_storage_types.md

doc/administration/server_hooks.md

doc/development/documentation/styleguide/word_list.md

doc/user/project/issues/design_management.md

locale/gitlab.pot