Steps to reproduce:

1. Select a language other than English
2. Create/load into world with cheats enabled
3. Run

   /tellraw @a {text:"text"}

Observed result:
The error message "Missing '}' or object member name" is not translated.

Expected result:
The error message "Missing '}' or object member name" is translated into your selected language.

Notes:
If you open the language file for en_us inside the bedrock-samples GitHub repository or find it in your Minecraft folder and search for "Missing '}' or object member name" translation key, you will notice that it is nowhere to be found.