Config Flow unloaded strings.json

I’m developping the config flow for the worldtidesinfocustom component.
I’m stuck : the strings.json is not loaded.

I’ve seen https://community.home-assistant.io/t/configflow-blank-form/246595, but even by removing internet browser cache : it’s not working …
See hereafter all configuration are blank

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Thanks a lot in advance
Is there a tool to perform some checks ?

The source file https://github.com/jugla/worldtidesinfocustom/tree/V3.1.0/custom_components/worldtidesinfocustom

Hello,
I made some modifications and it works. As there is no log , I don’t know what was the root cause. May be, if someone else fall on the issue …

What I’ve done, in the custom_components/worldtidesinfocustom :

  • remove all empty lines at the end of strings.json
  • create translations folder
  • create an en.json in translations folder