The menu item which has same meaning of "Create a Swagger Test" does not exist at Quick Start Window in DevTest Workstation with Japanese language setting.
However, the menu item named "Create a Swagger Test" exists at Quick Start Window in DevTest Workstation with English language setting.
This is a known defect of DevTest Workstation for DevTest 10.2. The problem is related to the feature for referencing the Japanese resources in DevTest Workstation.
Please contact CA Support and open a case to handle this problem to get the solution. CA support will deliver the patch for this problem. The patch name is patch_DE343121_10.2_GA.jar.