#1.Translate all text on theme: I installed Loco translate plugin for you, please go to translate text on theme, search your text and add translate.
#2. Send email: You need to install SMTP plugin and config to send mail, follow guide at https://www.wpbeginner.com/plugins/how-to-send-email-in-wordpress-using-the-gmail-smtp-server/
#3. I resolved this issue.