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@themaciekk Hello! I confirmed this mistranslation was fixed in latest version! Thanks!! 
Hello! I confilmed this issue was fixed on Opera Stable 62.0.3331.18. Thanks!!
I found this tweet. This user said "Extension button showed at the bottom side of Sidebar."
https://twitter.com/BellCocoa1/status/1142851263916232705
I am Mac user. So, I can't try Opera GX. Please tell me! Extension's sidebar are integrated with Sidebar? If it is true, it is nice. So I hope Opera for PC will change to that.
I don’t know this feature "Video Over Game". This feature and Video popout are not same isn’t it? What is the difference about this feature and Video Popout?
"Video Over Game"：Opera EX
https://www.opera.com/ja/gx#video-over-game
Official Twitter account anounced Opera GX will be release in E3. It is June 11 at 8:00 AM (Time Zone:PDT).
@kyu3 said in Opera GX is coming soon...:
I think Opera GX will have these features.
- Discord on sidebar.
- Change UI color
- Support Razer Chroma.
- Game infromation ( Ranking, News, Messeage, and so on) on Home page or sidebar.
- Do the task of tab of game as priorty.
- Not Hibernation the tab of game
- Easy to record the game video.
I add the expected feture. It's to be support Google Stadia. Google said the Stadia games were able to play by Chrome. But they didn't say Stadia games were able to play by other browsers. But if users could to play Stadia games by Opera GX, Opera GX would get advantage as "Gaming browser".
I think Opera GX will have these features. 
Hello! I used Opera Stable 60.0.3255.116 on macOS Mojave 10.14.5. The extension's sidebar don't show on macOS full screen mode.
Capture this issue↓↓
https://www.youtube.com/watch?v=kmPt6lhuyOE
Incidentally, I sent this bug's report. This issue's bug number is "DNAWIZ-62309".
I was sent the mail about this issue from Opera Staff. Opera Staff said. "This issue was already fixed on Opera Beta. So, this issue will be fixed soon on Opera Stable."
I use Opera Stable 60.0.3255.83 on macOS Mojave 10.14.4. When I closed activity background tab by closed button, Afterimage of closed tab appeared like this video.
https://www.youtube.com/watch?v=MJj62l72buM
Incidentally, When I clicked this afterimage, this afterimage disappeared. And I sent the bug report about this issue.
[Update 2019/05/13]
This bug's ID is "DNAWIZ-60699".