Email notifications have values injected in incorrect order

[Tmpod]

Issue Summary

Admin email notifications (such as new applications) are filled with the appropriate values in an incorrect order.

For example: I got an email with the subject lemmy.pt has applied to join jksahdasd.

Steps to Reproduce

1. (for example) I clicked login, and an endless spinner show up.
2. I tried to install lemmy via this guide, and I'm getting this error.
3. ...

Technical details

• A i18n template, like this one, gets filled through a Lang object (like this) which is generated by rosetta-i18n.
• After presenting this issue in one of the Matrix rooms, Dessalines pointed at Parameter order is incorrect and appears to be random. baptiste0928/rosetta#8