Language options
In this section:
The Language options are available by choosing Tools>Options.

Use this page to specify the language to be used in windows, menus, dialog boxes, etc.
Language
Selects the language to be used. The available languages depend on your product package, English (United States) and Japanese (Japan).
Note
If you have installed IAR Embedded Workbench for several different toolchains in the same directory, the IDE might be in mixed languages if the toolchains are available in different languages.