Continuing a discussion with @ljpp at our forum. Technically speaking the current description is ok, but otherwise I think it needs to be changed. I think that it is clumsy and can even be mislead a user to think that the badge is awarded on the first anniversary only.
This badge is granted when you’ve been a member for a year with at least one post in that year. Thank you for sticking around and contributing to our community. We couldn’t do it without you.
We ended up suggesting that the description should be changed to this.
This badge is granted annually to celebrate the anniversary of your membership, provided that you posted once or more during the past year. Thank you for sticking around and contributing to our community. We couldn’t do it without you.
I generally don’t agree with “anniversary” as the terminology here. Perhaps it could say
This badge is granted each year you’ve been a member with at least one post in that year. Thank you for sticking around and contributing to our community. We couldn’t do it without you.
But sure, feel free to change that copy on your instance via Admin, Customize.
We already made the local change for Finnish at our forum and I also made a more subtle refinement for the general Finnish locale.
The change you proposed clears any possible confusion, too. So it would be fine. I let native speakers decide what kind of change the English string needs.
Un certain nombre de personnes (96) sur nos forums ont soudainement reçu des badges d’anniversaire hier soir - est-ce censé se déclencher à un moment précis, comme le jour de l’anniversaire de l’inscription de l’utilisateur ? Ce n’était évidemment pas le cas pour nous car je connais beaucoup de personnes qui ont été soudainement récompensées et il est extrêmement improbable que nous nous soyons inscrits le 5 mai.
Je suis plus curieux de savoir si cela fonctionne réellement. Je n’ai que 10 badges d’anniversaire, mais j’en devrais avoir au moins 20 (j’ai toujours été administrateur de nos forums). Il y a un écart de 10 ans (2005 à 2014). J’ai vérifié les badges de quelques utilisateurs actifs de longue date et j’ai confirmé que certains avaient reçu des badges les années où d’autres non.
This makes more sense than 
