display quest names in client's native language in game info window

src/Quest.cc

@@ -335,9 +335,29 @@ uint32_t Quest::versions_key(Version v, uint8_t language) {
   return (static_cast<uint32_t>(v) << 8) | language;
 }
 
+const string& Quest::name_for_language(uint8_t language) const {
+  if (!this->names_by_language.at(language).empty()) {
+    return this->names_by_language[language];
+  }
+  if (!this->names_by_language[1].empty()) {
+    return this->names_by_language[1];
+  }
+  for (const string& name : this->names_by_language) {
+    if (!name.empty()) {
+      return name;
+    }
+  }
+  return this->meta.name;
+}
+
 void Quest::add_version(shared_ptr<const VersionedQuest> vq) {
   this->meta.assert_compatible(vq->meta);
   this->versions.emplace(this->versions_key(vq->version, vq->language), vq);
+
+  auto& name_by_language = this->names_by_language.at(vq->language);
+  if (name_by_language.empty()) {
+    name_by_language = vq->meta.name;
+  }
 }
 
 std::shared_ptr<const SuperMap> Quest::get_supermap(int64_t random_seed) const {

src/Quest.hh

@@ -94,6 +94,7 @@ struct Quest {
   QuestMetadata meta;
   mutable std::shared_ptr<const SuperMap> supermap;
   std::map<uint32_t, std::shared_ptr<const VersionedQuest>> versions;
+  std::array<std::string, 8> names_by_language;
 
   Quest() = delete;
   explicit Quest(std::shared_ptr<const VersionedQuest> initial_version);
@@ -106,6 +107,8 @@ struct Quest {
 
   std::shared_ptr<const SuperMap> get_supermap(int64_t random_seed) const;
 
+  const std::string& name_for_language(uint8_t language) const;
+
   void add_version(std::shared_ptr<const VersionedQuest> vq);
   bool has_version(Version v, uint8_t language) const;
   bool has_version_any_language(Version v) const;

src/ReceiveCommands.cc

@@ -2265,7 +2265,7 @@ static asio::awaitable<void> on_09(shared_ptr<Client> c, Channel::Message& msg)
 
           if (game->quest) {
             info += (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) ? "$C6Quest: " : "$C4Quest: ";
-            info += remove_color(game->quest->meta.name);
+            info += remove_color(game->quest->name_for_language(c->language()));
             info += "\n";
           } else if (game->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS)) {
             info += "$C6Quest in progress\n";