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/co.yml

@@ -118,9 +118,7 @@ co:
       email_status: Statutu di l’e-mail
       enable: Attivà
       enabled: Attivatu
-      feed_url: URL di u flussu
       followers: Abbunati
-      followers_url: URL di l’abbunati
       follows: Abbunamenti
       header: Intistatura
       inbox_url: URL di l’inbox
@@ -148,10 +146,8 @@ co:
       no_account_selected: Nisun contu hè statu cambiatu postu ch'ùn c'eranu micca selezziunati
       no_limits_imposed: Nisuna limita imposta
       not_subscribed: Micca abbunatu
-      outbox_url: URL di l’outbox
       pending: In attesa di rivista
       perform_full_suspension: Suspende
-      profile_url: URL di u prufile
       promote: Prumove
       protocol: Prutucollu
       public: Pubblicu
@@ -174,7 +170,6 @@ co:
         moderator: Muderatore
         staff: Squadra
         user: Utilizatore
-      salmon_url: URL di Salmon
       search: Cercà
       search_same_ip: Altri utilizatori cù listessa IP
       shared_inbox_url: URL di l’inbox spartuta