Created attachment 622518 [details]
/var/log/YaST2/y2log

In setting Language and locale, first I tried to set locale to EN-AU and it
failed. I then tried EN-GB, which was more successful, downloading several
packages and installing them, until it came up with an error before completing:

Internal error. Please report a bug report with logs.
Details: Invalid action for proposal :UpdateGfxMenu"
Caller: /usr/share/YaST2/lib/installation/proposal_client.rb:77:in 'run'

[After rebooting, the date format in thunderbird has not been corrected by the
attempted locale change.]