Simplify email template

[jancborchardt]

@skjnldsv as discussed :)

Verification email	welcome email

border-radius:3px on those buttons as per our standard would be cool to, or is there a reason we left that out?

[nickvergessen]

I dont think most email clients support border radius

[jancborchardt]

@nickvergessen ah ok. We could just add it and then it’s skipped when not supported.

[Django-BOfH]

What a 'bout really simplifying email templates ('cause there are some strange errors with html mails => #9102) and send plain-text mails as a (configurable option! => #9031)

[jancborchardt]

@Django-BOfH let's not derail this issue. As you mentioned, issues for those separate discussions exist already.

[c0fe]

@jancborchardt @nickvergessen here is a guide to what is supported on what email clients:

https://www.campaignmonitor.com/css/box-model/border-radius/