After an upgrade, my Thnderbird started to use a weird US-date format and forgot my setting for this. I did not find any setting either. But this seems to work fine: Create a shell script #!/bin/bash export LC_TIME=sv_SE.utf8 export LC_DATE=sv_SE.utf8 exec /usr/bin/thunderbird and make sure that this gets called when thunderbird is started instead of …
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