We attempted localization in the past. It's not just the game that needed to be translated, it was also needing Customer Support, the website, patch notes, etc. It didn't affect the game positively in any way.
The only effect it had was upsetting the native speakers of that language and more importantly, it slowed us down increasing the time it took for us to create content because we had to wait for the localized text in order to release any content. Any minor changes to the content would require another round trip with localization.
-ALS
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