Made the theme button toggable by keyboard
Added aria-label to many <a> without any text (usually, they contains Font Awesome icons)
Added aria-hidden whenever necessary
Labelled the "Copy URL and Description" contained in footer
Added an hidden label for the menu toggle for mobile accessibility
Changed some colors to meet the Color Contrast AA level: https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html
* Update Wire's metadata warning for clarity
* Update cardv2 to support commas in labels
* Update label delimiter to |
* Update label delimiter to | for badges
* Update cardv2.html formatting
Thunderbird is no longer developed by Mozilla.
https://blog.mozilla.org/thunderbird/2017/05/thunderbirds-future-home/
github.com/thundernest does not contain source code of Thunderbird client
> comm-central is the main Thunderbird repository.
> Thundernest contains the code for Thunderbird.net (this site),
as well as the Thunderbird web server setup scripts.
from https://www.thunderbird.net/en-US/get-involved/
In _includes/cardv2.html add `source`, because git is not the only
version control available (there is Mercurial, Subversion, CVS)
