Hi there, Brian! Thanks for reaching out.
It looks like the issue before was that “You’ll receive your tickets in another email.” was not a translatable string. That has since been fixed, as noted in the previous thread. So, the good news is that there is no bug–the string just needs to be translated.
The string is now in the translation catalogue for the plugin–it just appears that no one has actually translated the string for your particular language. We really depend on the community for translations, so I would suggest opening a thread in our Translations forum if you would like assistance with a translation for this particular string.
An alternative is to update the language file (.po/.mo) for your site directly. Strings for the plugin rely on the localized language files for your site, which are independent of the plugin.
Or, another option is to use the same snippet suggested in your previous thread. It’s less ideal since–as you noted–it could be overwritten, but it does still work.
I hope this helps answer your question and points you in the right direction. 🙂
Cheers!
Geoff