Add translation comments for trusted word

src/network/server.cpp

@@ -114,6 +114,11 @@ Server::Server(const XMLNode& server_info) : m_supports_encrytion(true)
         // not operated by us). #3691 will introduce the various states
         // required to properly distinguish between trusted, ranked,
         // and official servers.
+
+        // I18N: Trusted means this server is trusted by team to not
+        // doing any modification on server side, so players playing
+        // in this server will not meet cheaters, and trusted server
+        // will optionally host a ranked matching game
         m_server_owner_name = _("Trusted");
         m_server_owner_lower_case_name = "trusted";
         return;