add spanish language entry

_content/tour/welcome.article

@@ -55,9 +55,9 @@ The tour is available in other languages:
 - [[https://go-tour-jp.appspot.com/][Japanese — 日本語]]
 - [[https://go-tour-ko.appspot.com/][Korean — 한국어]]
 - [[https://go-tour-pl1.appspot.com/][Polish — Polski]]
+- [[https://go-tour-lat.appspot.com/][Spanish — Español]]
 - [[https://go-tour-th.appspot.com/][Thai — ภาษาไทย]]
 - [[https://go-tour-ua-translation.lm.r.appspot.com/][Ukrainian — Українською]]
-- [[https://go-tour-lat.appspot.com/][Spanish — Español]]
 
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