Make the remaining string of #3962 translatable too

src/synced_user_choice.hpp

@@ -13,6 +13,7 @@
 
 #pragma once
 
+#include "gettext.hpp"
 #include "config.hpp"
 #include "events.hpp"
 #include "generic_event.hpp"
@@ -35,7 +36,10 @@ struct user_choice
 	///whether the choice is visible for the user like an advancement choice
 	///a non-visible choice is for example get_global_variable
 	virtual bool is_visible() const { return true; }
-	virtual std::string description() const { return "input"; }
+	// TRANSLATORS: In networked games, this text is shown for other clients,
+	// while they wait for an action from another player.
+	// This text will be embedded into a sentence.
+	virtual std::string description() const { return _("waiting for^input"); }
 };
 
 /**