Cleanup/refactor tables: additional_service_field_value and dynamic_field_template

The table `additional_service_field_value` is no more used -> could be dropped.

The table `dynamic_field_template` is a read only table that contains some templates for the dynamic fields. It contains also some text that must be translated, and unfortunately, as the translations are hardcoded inside, they are not up to date. -> we could drop the table, move the translations in the property files and hardcode directly the values in the code of the repository.