simulation: improve equivalence testers explanations messages
With latest simulation, the explanation given to user when solving a divergence was not good enough : - Property ids were displayed without possibility to display business word (like displaying 'stop_date' instead of 'Delivery Date' - Some message was displayed in the solve divergence dialog whatever was the equivalence tester behind. Therefore, customizations of messages made a equivalence tester level were not displayed to user Therefore, following was done: - in solve divergence dialog, include the message generated by the equivalence tester - use tested_property_title to allow using business words to describe properties having divergence - most equivalence testers are written in a way to evaluate divergence on a single property. To have better UI configuration of such equivalence testers, change tested_property and tested_property_title properties type from "lines" to "string". This required to add some backward compatible code. - use Variation Divergence Tester to show a case of an equivalence tester using different properties. For this, add a property sheet dedicated to multi properties equivalence testers - update propertysheets to allow translating tested_property_title Conflicts: product/ERP5/Document/DateTimeEquivalenceTester.py
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