[#50832459] User can change execution location of a work flow.

- Open ChangeWorkFlowExecutionLocation dialog when 'Change' button is
clicked.
- Enable save button when the execution location picker is ready.
- Use assign_attributes and update_from_params! instead of
update_attributes!.
- Add translations for ChangeWorkFlowExecutionLocation.
- Add '.location_picker' to the schema picker styles.