Update the `/docs/i18n.md` for updated glob syntax for `makemessages`.
Merge branch 'develop' into feature/2472-have-makemessages-scan-handlebars-files-to-extract-translatable-strings
Merge pull request #2722 from mrpau/feature/2472-have-makemessages-scan-handlebars-files-to-extract-translatable-strings

Update `/docs/i18n.md` with blob syntax change for `makemessages`.