[nachox77]

Here is the wikipedia.lua file with default values:

local JSON = require("json")
local DEBUG = require("dbg")

--[[
-- Query wikipedia using Wikimedia Web API.
-- http://en.wikipedia.org/w/api.php?ac...=&titles=hello
--]]

local Wikipedia = {
wiki_server = "https://%s.wikipedia.org",
wiki_path = "/w/api.php",
wiki_params = {
action = "query",
prop = "extracts",
format = "json",
exintro = "",
explaintext = "",
redirects = "",
},
default_lang = "en",
}

function Wikipedia:getWikiServer(lang)
return string.format(self.wiki_server, lang or self.default_lang)
end

--[[
-- return decoded JSON table from Wikipedia
--]]
function Wikipedia:loadPage(text, lang, intro, plain)
local socket = require('socket')
local url = require('socket.url')
local http = require('socket.http')
local https = require('ssl.https')
local ltn12 = require('ltn12')

local request, sink = {}, {}
local query = ""
self.wiki_params.exintro = intro and "" or nil
self.wiki_params.explaintext = plain and "" or nil
for k,v in pairs(self.wiki_params) do
query = query .. k .. '=' .. v .. '&'
end
local parsed = url.parse(self:getWikiServer(lang))
parsed.path = self.wiki_path
parsed.query = query .. "titles=" .. url.escape(text)

-- HTTP request
request['url'] = url.build(parsed)
request['method'] = 'GET'
request['sink'] = ltn12.sink.table(sink)
DEBUG("request", request)
http.TIMEOUT, https.TIMEOUT = 10, 10
local httpRequest = parsed.scheme == 'http' and http.request or https.request
local code, headers, status = socket.skip(1, httpRequest(request))

-- raise error message when network is unavailable
if headers == nil then
error("Network is unreachable")
end

if status ~= "HTTP/1.1 200 OK" then
DEBUG("HTTP status not okay:", status)
return
end

local content = table.concat(sink)
if content ~= "" and string.sub(content, 1,1) == "{" then
local ok, result = pcall(JSON.decode, content)
if ok and result then
DEBUG("wiki result", result)
return result
else
DEBUG("error:", result)
end
else
DEBUG("not JSON:", content)
end
end

-- extract intro passage in wiki page
function Wikipedia:wikintro(text, lang)
local result = self:loadPage(text, lang, true, true)
if result then
local query = result.query
if query then
return query.pages
end
end
end

return Wikipedia

I changed both variables:
default_lang="es" //instead of "en"
wiki_server="https://es.wikipedia.org" //instead of "https://%s.wikipedia.org"

(I don't know what means "%", it doesn´t look like a joker char)

And it doesn´t work, it keep giving me english text as answers. May be i'm losing some variable