Hello Citizens of Dalaran,
After the next big update which is scheduled to happen the next 19th of May, Dalaran-WoW will be supporting several client language packs. For now, Spanish, French, Russian and German shall be supported. However, since we also have a small Chinese community, we might include it to such update.
Note that this is client wise localization and not related to the ingame assistance or general chat rules, which will still require English. Now quests, NPCs, items and many more things will be available for those players who prefer to play on their own language.
Thank you very much.