Summary:
The [Intentional Game Design] on the death message (you can get it when you die due to use a bed in the nether etc, but also by block_explosion (MCPE-178184)) isn't translated. On java, it's translated.
Affected Languages:
DanishDutchGreekIndonesianJapaneseRussian
SlovakSimplified ChineseTurkish
Steps to Reproduce (Used Japanese):
Set language to japanese
Run the command: /damage @s 20 block_explosion
See the death message
Expected Results:
You get "<player> は [ゲームの仕様] に倒された"
Observed Results:
You get "<player> は [Intentional Game Design] に倒された"
Linked issues
Attachments
Comments 6

These also affects Simplified Chinese, as "Intentional Game Design" is not translated in Bedrock Edition but it is on Java Edition, however for Traditional Chinese, "Intentional Game Design" is translated in both versions (Bedrock and Java).
Below is the text string for Simplified Chinese I found from https://github.com/Mojang/bedrock-samples/archive/refs/tags/v1.20.50.3.zip:
"death.attack.explosion.by.bed=%1$s被[Intentional Game Design]杀死了 #", or "<player>被[Intentional Game Design]杀死了" in-game, can be reproduced from the report but in Simplified Chinese instead of Japanese,
And the same death in Minecraft: Java Edition I have done via "/damage @s 999 minecraft:bad_respawn_point", in Simplified Chinese, it's "<player>被[刻意的游戏设计]杀死了".
I have surfed most language files in "bedrock-simples-1.20.50.3/resource_packs/texts/" and most of them have "Intentional Game Design" translated, except Danish, Dutch, Greek, Indonesian, Japanese (shown above), Russian, Slovak, Simplified Chinese (in this comment) and Turkish, these have "Intentional Game Design" untranslated in Minecraft: Bedrock Edition.
The czech translation is butchered to "Mezinárodní herní dyzajn", which translates to international game design.
Tested on bedrock 1.20.80