The bug

Since 1.16 Pre-release 5, the game mode descriptions in the world creation menu are no longer centered in the button, but rather, aligned to the left of it. While this may not be a problem in the English language, some other languages require much longer lines to accurately convey the same information, which causes it to become visually imbalanced — the extra length is no longer distributed to both sides, but instead overflows to the right part of the screen. In many of those languages, there's no way to shorten the text without also harming the comprehension, so it requires translators to make a compromise between clarity and visual appeal.

Below are some screenshots of the Portuguese translation comparing its appearance before and after the change.