Fix : Update environment variable that defines the language of the site

[boss6825]

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Closes #6747

[boring-cyborg]

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[davisagli]

The PR is completely wrong (touches way too many files). It looks like you moved everything in the repository into a folder named volto

[boss6825]

Sorry for this huge mistake
should i edit this PR or just make a new one with corrections?

[davisagli]

@boss6825 You can do either one, whichever is easiest.