Use a hidden-chat-specific not-accessible toast

Telegram/Resources/langs/lang.strings

@@ -2287,6 +2287,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_community_hidden_chat_about" = "Only invited members and community admins will see this chat.";
 "lng_community_hidden_status" = "Hidden";
 "lng_community_hidden_chat_title" = "Hidden Chat";
+"lng_community_hidden_not_accessible" = "You can't join or view this group until an admin invites you.";
 "lng_community_join_sure" = "Do you want to join {group}?";
 "lng_community_admin_title" = "You are a community admin";
 "lng_community_admin_about" = "You can now edit {community} info and use other admin tools.";

Telegram/SourceFiles/dialogs/dialogs_community_requestable_list.cpp

@@ -124,7 +124,8 @@ CommunityRequestableList::CommunityRequestableList(
 		const auto joinable = channel
 			&& (!community->isHidden(peer) || channel->amCreator());
 		if (!joinable) {
-			_controller->showToast(tr::lng_group_not_accessible(tr::now));
+			_controller->showToast(
+				tr::lng_community_hidden_not_accessible(tr::now));
 			return;
 		}
 		const auto join = [=](Fn<void()> close) {