Resolve "Trim welcome fields before submission"

More semantically clear.

Also update text fields with trimmed string.

Improve localization submission with some tricks

In case it changes.

Resolve "Add sibling links to redeem page"

Breaks manual redeem page exclusion, but simplifies sibling links.

index = log2(page)

Makes credentials redundant otherwise.

Set keyboard and content type for welcome fields

Redeem email had wrong keyboard. Add content type where
applicable.

Disable code signing in Demo

Make it work on simulator without much hassle.

QA: Ping times, TOS

Move agreement text below submit buttons

Resolve "Consent to email use and TOS (GDPR)"

Resolve "Add welcome sub-screen to redeem trials/gift-cards"

In both keyboard and delegate.

Work around solid backgrounds in some assets. Zeplin export crops
transparent areas.

They were unlocalized in the storyboard.

Make Signup* use both signup and redeem requests. Reuse failure
vc with dynamic image/messages based on error parameter.

Pack signup metadata.

Model:

- Signup email
- Created user

Graphical:

- VC title
- Body image
- Body title
- Body subtitle (message)