fixup! web_renderjs_ui: use lxml to extract data-i18n messages

a928abd2 (web_renderjs_ui: use lxml to extract data-i18n messages, 2020-12-14)
was an old version of the patch that was pushed accidentally. This applies
the missing bits.
5 jobs for fix/trade_order_report
Status Job ID Name Coverage
  External
failed ERP5.UnitTest-Master

04:04:09

failed ERP5.UnitTest-Master.Medusa

passed SlapOS.Eggs.UnitTest-Master.Python2

00:28:47

passed SlapOS.Eggs.UnitTest-Master.Python3

00:28:27

failed ERP5.UnitTest-Master