I made this tiny powershell script to import localized quest text in the database (table “quest_request_items_locale” and “quest_offer_reward_locale”). Localized quest data are now missing and even in wowhead are not completely translated it’s useful for my personal usage.
https://github.com/Ryzen-0/TC-LocalizeQuest
Just execute it and paste wowhead url zone, es.
https://it.wowhead.com/quests/northrend/icecrown
and sql file will be generated.
In the lastest version it will generate also a separated zone files for missing localized quests, translated by google as fallback.