What gender of users posted the most tweets in `en`?
"en" is the language and refers to Lang = 'en'; most tweet in 'en' refers to Max(Count(text where Lang = 'en'))
SELECT T.Gender FROM ( SELECT T2.Gender, COUNT( text) AS num FROM twitter AS T1 INNER JOIN user AS T2 ON T1.UserID = T2.UserID WHERE T1.Lang = 'en' GROUP BY T2.Gender ) T ORDER BY T.num DESC LIMIT 1