The Gems of War help center only supports English.
Unfortunately, there is no plans to localise the Help Center to other languages in the near future. Localising the Help Center requires new translations of all 200 existing article content by a dedicated team and is not done automatically by Zendesk.
Some important page elements used in Help Center are already localized to your language. For example, the element that lets you vote on a Gems of War article displays "Was this article helpful?" in English and "Cet article vous a-t-il été utile?" in French.