自動メールの誤り:新規 TL 向け(it)

There are some formatting issues in the automatic email for a new trust level
How can I fix it?

Looks like it’s now a customizable email.

You have extra spaces in the link markup

yes, the questions is: how can I edit it?

In Personalizza > Testo, just search system_messages.welcome_tl1_user.text_body_template and edit it.

「いいね!」 2

Fixed, thank you.
How can I add it to the official translation?

Check out the translations at Transifex, see Translating Discourse with Transifex

「いいね!」 1