Review for English (en-GB) Language Pack by ytzsch
Rated 5 out of 5 stars
Worked OK once I worked out how to install. In Thunderbird. Download the file and then from the menu on the toolbar, select Tools, then Add-ons. In the centre window at the top is a gear symbol, select this and choose install from file.
This review is for a previous version of the add-on (52.0).To create your own collections, you must have a Mozilla Add-ons account.