Improve Gravatar alt text, fix request fail design

[WebFreak001]

I have made this an API breaking change because I assume no other project is using that Gravatar function, so I replaced all the occurrences and to make the code more readable + prevent users from passing in empty alt texts, which is bad for accessibility.

Before:

After:

[WebFreak001]

Separated the alt and title attributes now and added aria-label identical to title, both of which is now only included, whenever the links link to Gravatar.