Show amount of peeps still on ride in tooltip when ride is closed (resolves #2708)

src/localisation/string_ids.h

@@ -2333,6 +2333,9 @@ enum {
 
 	STR_OPTIONS_RENDERING_TIP = 5734,
 
+	STR_CLOSED_WITH_PERSON = 5737,
+	STR_CLOSED_WITH_PEOPLE = 5738,
+
 	// Have to include resource strings (from scenarios and objects) for the time being now that language is partially working
 	STR_COUNT = 32768
 };