Add copy of about:rights page from Firefox
Minor changes in copy have been made to make the text work in a static document (the in-browser version has a few sections hidden behind disclosure links)
Bug 1052571
Add Thunderbird about:rights content (Bug 1055007)
Text adjustments based on feedback from @mikaland2
Text changes for @mikaland2
Merge pull request #169 from sgarrity/bug-1055007-thunderbird-legal

Add Thunderbird about:rights content (Bug 1055007) Text changes approved.
Merge pull request #166 from sgarrity/bug-1052571-about-rights

Add copy of about:rights page from Firefox.  Text changes approved.