Add ability to filter followed accounts' posts by language (#19095)

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -145,6 +145,17 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
         expect(json[:showing_reblogs]).to be false
         expect(json[:notifying]).to be true
       end
+
+      it 'changes languages option' do
+        post :follow, params: { id: other_account.id, languages: %w(en es) }
+
+        json = body_as_json
+
+        expect(json[:following]).to be true
+        expect(json[:showing_reblogs]).to be false
+        expect(json[:notifying]).to be false
+        expect(json[:languages]).to match_array %w(en es)
+      end
     end
   end