Improve and expand Alt-text detection

[bitfl0wer]

The following features should be implemented to make the bot a bit smarter (courtesy: @KreerC):

• If the message attached to the image contains alt text in the form "Alt: ...", no reminder should be sent.
• If someone adds an alt text message after the fact, the alt text reminder message should go away on its' own. I don't really know what this behaviour should look like, but here are a few ideas:

1. If you reply to the original message using the proper reply feature AND the message contains "Alt: ...", the alt text reminder message should go away on its' own
2. If you just send a new message that contains the chars "Alt: ...", the alt text reminder message should go away on its' own.
3. We don't implement this second feature at all. I personally think that it makes more sense to include the alt text with the images that get posted and not somewhere later in the chat. Including it as a message instead of the image alt attribute might be fine, but the image and its' descriptions should - in my opinion - always be together. What do you say, @KreerC ?

[KreerC]

Regarding this,

We don't implement this second feature at all. I personally think that it makes more sense to include the alt text with the images that get posted and not somewhere later in the chat. Including it as a message instead of the image alt attribute might be fine, but the image and its' descriptions should - in my opinion - always be together.

I agree to the point that having the image and its description tied together is of course always the best option, but allowing an alt text afterwards and auto-removing the message when it detects that will most definitely reduce user friction and frustration. Any alt text is better than none.

Visible descriptions or responses to the notification might motivate other users to write alt texts themselves.