Update about.md (#778)
Update about.md (#778)

Fixed some translation errors, some writing errors, and finished some missing translations. In spanish is customary to write in cursive foreign words, hence the <em> around "Let's Encrypt" (https://www.fundeu.es/recomendacion/extranjerismos-cursiva/)

letsencrypt/website,letsencrypt/website,letsencrypt/website