Please note that this issue has been occurring on Switch for at least four months.

Indeed, when launching Minecraft bedrock on Switch, all categories will display as placeholders. This issue affects all languages, including en-US.

Prerequisite:

Have access to the internet and link Minecraft bedrock with a Microsoft Account.

Repro Steps:

Launch the game in any locale.
Proceed to the Marketplace.
Notice the issues all over the marketplace.

Expected Fix:

All headers are implemented correctly on the Marketplace of the Nintendo Switch's Minecraft Bedrock.