Add "Followers you know" to hovercard (#34769)

app/javascript/mastodon/locales/en.json

@@ -42,6 +42,7 @@
   "account.followers": "Followers",
   "account.followers.empty": "No one follows this user yet.",
   "account.followers_counter": "{count, plural, one {{counter} follower} other {{counter} followers}}",
+  "account.followers_you_know_counter": "{counter} you know",
   "account.following": "Following",
   "account.following_counter": "{count, plural, one {{counter} following} other {{counter} following}}",
   "account.follows.empty": "This user doesn't follow anyone yet.",