For non-web software with a user interface within the ICT, the software has to satisfy the WCAG 2.2 criteria of this group: the default human language programmatically set (11.3.1.1). The software-language criterion applies to open functionality (Table 11.14); language of parts is void.
This control maps to 2 controls across 2 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.
The graph holds this control, the 2 it maps to, and the evidence behind each claim, over MCP and REST.