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This tries to improve worklists on support request app frontpage:

• add a basic zelenium test

• use portal workflow API, which scales properly, but (unfortunately) has a 5 minutes delay. In a sense, it's a regression, but it's consistent with worklists everywhere else in ERP5.

• add a workaround for bug #20180907-24A654C

• now worklists are translated server side by Localizer (although the test for translation is not included in this MR)

• this also fixes a bug that SupportRequestModule_createSupportRequest was creating two support requests