Remove unused translatable strings (#12643)

* Remove unused “salmon_url” string

* Remove more unused translatable strings

The following strings all used to be on the admin account page
but aren't used anymore: profile_url, outbox_url, followers_url, feed_url

config/locales/sr-Latn.yml

@@ -47,9 +47,7 @@ sr-Latn:
       email_status: Status e-pošte
       enable: Uključi
       enabled: Uključeno
-      feed_url: Adresa dovoda
       followers: Pratioci
-      followers_url: Adresa pratioca
       follows: Praćeni
       inbox_url: Adresa sandučeta
       location:
@@ -69,9 +67,7 @@ sr-Latn:
       most_recent_activity: Najskorija aktivnost
       most_recent_ip: Najskorija IP adresa
       not_subscribed: Nije pretplaćen
-      outbox_url: Odlazno sanduče
       perform_full_suspension: Izvrši kompletno isključenje
-      profile_url: Adresa profila
       promote: Unapredi
       protocol: Protokol
       public: Javno
@@ -87,7 +83,6 @@ sr-Latn:
       roles:
         staff: Osoblje
         user: Korisnik
-      salmon_url: Salmon adresa
       search: Pretraga
       shared_inbox_url: Adresa deljenog sandučeta
       show: