Ensure the region feature works in the key messages for NS and in the api call

[ezesanchez]

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[ezesanchez]

When regions were created without a selected language, they were not visible because they lacked translations.
To determine the current languages, they are retrieved when the fetchContent action from Vuex is called. This action uses the getAvailableLanguages API call for the Instruction model, which fetches data from the whatnow_entity_translation. Therefore, if the NS does not have any messages, it does not have available languages.
@l-dufour has set English as the default language when NS does not have any available languages.

Global states into “content“ vuex module: