Quick Answer
Guildrun Japanese localization is 待确认 in the collected material. The patch notes mention localization preparation and localization/text fixes, but the material does not confirm that Japanese is already supported. Do not claim a Japanese translation exists unless an official Steam language list, Leyline post, or in-game setting confirms it.
What the Material Confirms
Patch history includes localization preparation in the Guildrun rename-era notes. It also includes localization/text fixes in later follow-up patch material. Those lines prove that localization work exists as a development topic.
They do not prove Japanese specifically. “Localization” can mean many languages, text cleanup, internal prep, UI fixes, or translation infrastructure. A page targeting this keyword should answer the question clearly and mark the exact Japanese status as 待确认.
What Players Should Check
Players should check the current Steam language table, the official Guildrun site, and Leyline patch notes. If Japanese appears in the Steam language table or in official patch notes, this page should be updated. Until then, avoid writing a how-to-change-language guide for Japanese.
Safe Site Wording
Use careful wording: “The collected patch material mentions localization preparation and text fixes, but Japanese localization is not confirmed in the available notes.” This is better than promising a feature that may not exist. If future material confirms Japanese, add exact source date, platform, and whether it covers interface, subtitles, or full audio.