[Trac] Encode errors after upgrading to 0.12.3

Hello,

I tried to upgrade Trac from 0.12.1 to 0.12.3 and I get a number of 
"UnicodeDecodeError: 'utf8' codec can't decode bytes in position 4-6: 
invalid data" errors from various places (not limited to a specific page 
or action, some pages are working others are not).

Upgrading with trac-admin does nothing.

What should I do to fix this issue ?

Regards,
Marco.

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