In this pre-release (and previous snapshots, I presume), Dark Grey / Grey Stained Glass is referred to as 'Gray' in Canadian, British, and Australian English when it should be referred to as 'Grey'. This error also applies to the panes of said glass. It's not a game-ruining bug, it's just a small typo.
Related issues
duplicates
Comments

Sorry, I didn't know that existed. I'm new at this.
This ticket is a language translation request and is not supported on this bug tracker.
Please use the Crowdin Minecraft Translation Project for all translation change or add requests.