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/views/public/regia/_volley.html.erb

@@ -1,7 +1,7 @@
 <p class="regia-sets" id="sets-line"><%= live_score_sets_label(@score) || "—" %></p>
 <p class="regia-score-line" id="score-line"><%= live_score_points_label(@match, @score) %></p>
 <p class="regia-partials" id="partials-line"<%= " hidden" unless live_score_partials_label(@score).present? %>>
-  Parziali: <%= live_score_partials_label(@score) %>
+  <%= t("regia.board.partials_prefix") %> <%= live_score_partials_label(@score) %>
 </p>
 
 <div class="regia-team-row">
@@ -12,7 +12,7 @@
     <button type="button" class="regia-btn regia-btn--minus" data-action="home_undo" style="width:100%;margin-top:6px">−</button>
   </div>
   <div class="regia-center-hint" id="center-hint">
-    <%= Scoring::Rules.from_match(@match).points_target(@score.current_set) %> pt
+    <%= Scoring::Rules.from_match(@match).points_target(@score.current_set) %> <%= t("regia.board.points_suffix") %>
   </div>
   <div>
     <div class="regia-team-name"><%= @match.opponent_name %></div>
@@ -21,4 +21,4 @@
     <button type="button" class="regia-btn regia-btn--minus" data-action="away_undo" style="width:100%;margin-top:6px">−</button>
   </div>
 </div>
-<button type="button" class="regia-btn regia-btn--yellow" data-action="close_set" style="margin-top:12px">Chiudi set</button>
+<button type="button" class="regia-btn regia-btn--yellow" data-action="close_set" style="margin-top:12px"><%= t("regia.board.close_set") %></button>