Remove Kickstarter campaign pop-up, since the campaign has succeeded and is almost over.

Translation updates.

Translation update

This add-on will no longer be supported when Thunderbird 78 is released in a few months, unless enough people commit to supporting continued maintenance of the add-on to make it feasible. To show your commitment, please visit https://www.kickstarter.com/projects/jik/rewritten-add-ons-for-mozilla-thunderbirds-next-release and make a pledge. As a bonus, Kickstarter supporters of this and my other add-ons will receive significant discounts on add-on licenses.

This release of the add-on adds a pop-up message warning users about the potential end of support and encouraging people to visit the Kickstarter campaign and support it.

More Thunderbird 68 compatibility changes. TB builds before 2019-05-20 will no longer work.

Bump compatibility in install.rdf to make installation more reliable.

Compatibility with Thunderbird 56+.

Fix issue which was occasionally causing the "All Body Parts" menu item to disappear after the add-on was installed. Sorry!