erp5_corporate_identity&test: fix UnicodeEncodeError when export in pdf
it's a regression introduced by https://lab.nexedi.com/nexedi/erp5/-/commit/1b555dbf6827d420ffd594a2308c4b273035c01d
Edited by Xiaowu Zhang
it's a regression introduced by https://lab.nexedi.com/nexedi/erp5/-/commit/1b555dbf6827d420ffd594a2308c4b273035c01d