I've created my first email sequence. Will ConvertKit automatically fill in the name of my subscribers? For example hello (firstname)? And how and where can I change "hello" in Dutch, because i'm from holland. I have already a list i would like to send the welcome email. How kan I send the email to the subscribers afterwards (all at once), because they are already in my subscribers list. I started building the subscriberlist first with a lead magnet and now I want to send them a sequence with the welcome email