5.0 prerelease 71

Latest prerelease, with some minor fixes

• Japanese splash pages fixed by Kozuke Kaizuka (on behalf of my SmartTemplates project)
• quickFilters Assistant showed at the top left of screen for unknown reasons, so I centered it.

As always, to install this beta version, please download the xpi file below to hard drive (right-click save as...) and then drag the downloaded file into Thunderbird 78 Add-on manager. Or drag the link to the xpi directly into Thunderbird Add-ons Manager.
A simple click on the link won't work as your browser may erratically think that it is a web extension (which it isn't).

• download xpi file from assets area using right-click:
  

• open Add-ons Manager, select extensions
  

• Drag the downloaded addon file into the extenions pane: