Completa i18n IT/EN/FR/DE/ES su sito pubblico, area autenticata e admin.

Tutte le view marketing, legali, viewer, dashboard e admin usano t(); mailer utente-facing e flash localizzati; admin con LocaleResolver e selettore lingua.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/public/registrations_controller.rb

@@ -8,7 +8,7 @@ module Public
     def create
       unless params[:accept_terms] == "1"
         @user = User.new(user_params.merge(role: "coach"))
-        flash.now[:alert] = "Devi accettare l’informativa privacy e i termini di servizio per registrarti."
+        flash.now[:alert] = t("flash.registrations.accept_terms_required")
         return render :new, status: :unprocessable_entity
       end
 
@@ -20,10 +20,10 @@ module Public
           invitation = TeamInvitation.pending.find_by(token_digest: Digest::SHA256.hexdigest(token))
           if invitation && invitation.email.downcase == @user.email.downcase
             invitation.accept!(@user)
-            return redirect_to public_team_details_path(invitation.team), notice: "Benvenuto nella squadra!"
+            return redirect_to public_team_details_path(invitation.team), notice: t("flash.registrations.welcome_to_team")
           end
         end
-        redirect_to public_new_club_path, notice: "Account creato. Ora registra la tua società."
+        redirect_to public_new_club_path, notice: t("flash.registrations.account_created")
       else
         flash.now[:alert] = @user.errors.full_messages.join(", ")
         render :new, status: :unprocessable_entity