Invalid translation of "translationKey=narration.suggestion" in command block GUI

Description

Open Narrator and then begin editing a Command Block. In common Narrator helps you gain the available elements with local language. However, what I've heard was like:

"translationKey=narration.suggestion"

Whatever she repeats but I'm sure that this piece of text should be correctly translated, but failed activating in the game itself.

I uploaded two versions of language in case you cannot get what's the difference.

How to Produce

1. Narrator on
2. Place a Command Block
3. Open its UI, but then next don't do anything, not even moving your mouse
4. Listen carefully

(×) You can catch words like "translation key" "narration" "suggestion" or any other else, even your game language is not English.