CommentContainer:threaded with long usernames on mobile display

Build 7069 on ab/discussion-spacing
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BaselineBuild 6911 on ab/bump-source-packages
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LatestBuild 7069 on ab/discussion-spacing
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Baseline History
Build 7069c1dab17
Current build. There are unaccepted changes, so build 6911 is still the baseline.
Build 6911da3a439 current baseline
Accepted by Anna Beddow.
Build 6787db61566
Accepted by Charlotte Emms.
Build 5728fd4f18e
Accepted by Sophie.
Build 56246145aac
Accepted by Sophie.
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