Nicolò Tarter

Added english translation of the Covid19 certificate page and minor translation corrections

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## Description This PR tackles: * Added English Covid19 certificate page (previously available only in italian). * Corrected minor translation mistakes. ## Checklist * [X] I followed the indications in...

Added english FAQ

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## Description This PR tackles: * Added English FAQ (previously available only in italian). ## Checklist * [X] I followed the indications in [CONTRIBUTING.md](https://github.com/italia/developers.italia.it/blob/main/CONTRIBUTING.md) * [X] The documentation related to...

Missing english translation of the website

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### Does a discussion already exist on the topic you are interested in, or on a similar topic? - [x] I verified and it doesn't exist ### What The website...