Eclipse+avnz03iw+change+language

Even if your screen is entirely in Japanese, follow these physical steps and visual cues. I have provided the Japanese menu text in parentheses so you can match the characters on your screen.

If that’s a workspace name, project ID, or some unique token from a tutorial or internal system, it’s not a standard Eclipse parameter.
If you meant -nl argument instead of that string — -nl (and -language in older versions) is the correct switch for language change. eclipse+avnz03iw+change+language

Would you like the exact .ini edit for a specific language + OS + Eclipse version? Even if your screen is entirely in Japanese,

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On the touchscreen, look for the icon that looks like a toolbox or wrench. The text below it will read 設定 (Settei). Tap it. On the touchscreen, look for the icon that

Visual cue: It is usually located in the bottom row or the top right corner of the screen.

Inside the System menu, you will see a list of sub-options. Look for the option that ends with the word 言語 (Gengo), which means "Language." The full text usually reads 言語設定 (Gengo Settei).

Alternative: On some firmware versions, the Language option is the very last item on the System page. Scroll all the way down.