Patches API v2 for OmegaT 5.6+

Built for release 203361b545c2ed3035cbb98573c7e630eaf2eee0 (2021-10-05 13:56:44) aka "5.6.0 release"

Works with v5.7.1 (c320625342a708aff3df81015000f04d9cf3b417, 2022-3-18 23:53:52)

Already tested until 
9c6faf07f269c314afbd1f10d5948b56e4f51edc (2022-02-16 13:48:15)

Adaptation needed for 5.8 will be done once this release is officially published,
or if it becomes finally possible to include these patches in it.
