This suggestion is cause of some community feedback. Some users in channel said, after they switch to l-test client for reviewing translate and daily gameplay, they feel it not so habitual to use, because they were using the English UI for years, and after they switch to translated interface, they can't find things as they remember.
I asked them, and recognized that all of them are old players, which already has a high rank (Trusted user, and most of them have vrcat) and very long playable time in this game.
I suggest to add a secondary language option in "main menu / setting / user interface / language selection" , just like how Blender Developers did in their software. For more details, here is my suggestion:
First, separate the language selection option from General UI Settings Window as an independent window, add an toggle which can offer a function to show some advanced setting.
Second, replace all UI element words as translated strings should be the normal option, and after open the toggle, they can select UI language rather than change the tooltips language together.