Add a test for exporting the source terms of modules. This will allow automated scripts to fetch latest terms Backport save_test_file with a parameter on date_format to have predictable filenames closes odoo/odoo#159373 X-original-commit: e7246ea48828746471a2e3a485bee30687eeee80 Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>