Implement Template view fixes/changes about mail-for-good HOT 3 CLOSED

Done:

• It's not clear how to save templates
• Issue a toast warning on form validation failure
• 'Create' button should be 'Save as a template'
• Transition from templates to create campaign is confusing, issue message e.g. "Message saved, sending you to create template page"

Remaining:

• When the editor's in plaintext mode, no rich text options should exist
• Template names should be autogenerated by default
• Preview transition is too quick - also throw a toast informing the user that a transition occurred
• Fix preview of templates
• Templates are not applied to the text box correctly

from mail-for-good.

Done:

• Templates are not applied to the text box correctly
• Fix preview of templates

Remaining:

• When the editor's in plaintext mode, no rich text options should exist
• Template names should be autogenerated by default
• Preview transition is too quick - also throw a toast informing the user that a transition occurred

from mail-for-good.

Done:

• When the editor's in plaintext mode, no rich text options should exist
• Template names should be autogenerated by default
• Preview transition is too quick - also throw a toast informing the user that a transition occurred

from mail-for-good.