Merge pull request adam-p#527 from adam-p/fix-tbird-intl

Fix adam-p#524 and adam-p#526: Broken in non-English Thunderbird

Merge pull request adam-p#520 from adam-p/tbird-fix

Fix adam-p#495: Stopped working in Thunderbird 60

Merge pull request adam-p#433 from adam-p/firefox-webextensions

Merge WebExtensions changes

Compress zip to be accepted by Chrome store

Bumped version number

Updated translations

Bumping version for another Mozilla release

Released a no-change version to try to correct Mozilla review issues.

Release prep

Updated Sof's link