Mention that it's impossible to change password through DC alone

[WofWca]

• Operating System (Linux/Mac/Windows/iOS/Android): Windows, Android

• Delta Chat Version: 1.46

• Expected behavior: It is made clear that you cannot update your password through Delta Chat - you have to do it through your email service and only then set the correct one in Delta Chat.

• Actual behavior: It looks like you can change your password through Delta Chat, like on any other service / messenger.

• Steps to reproduce the problem:

  1. Go to Advanced Settings
  2. Go to "Account and Password"

• Screenshots:

  

• Logs: none

The issue was worsened by deltachat/deltachat-desktop#4032) in Delta Chat desktop. But even when it is fixed, Delta Chat would still simply say something like "failed to authenticate" when you change your password and continue operating as usual (see deltachat/deltachat-desktop#4033 ).

So it appears that these settings are only useful when

• you've changed your password outside of Delta Chat, which (I suppose) would make Delta Chat unable to use the account.
• You want to change the email address.

But I think simply adding a paragraph stating that you have to change the password outside of DC first would be good already.

Forum posts about changing password:

• https://support.delta.chat/t/view-and-change-account-password/3024?u=wofwca
• https://support.delta.chat/t/change-account-password/773?u=wofwca
• https://support.delta.chat/t/chatmail-technical-questions/2854/7?u=wofwca