To change the language in TIBCO Data Virtualization add the line after ' '%VM_ARGS%' in the studio.bat file. For example, to change the language from English to Japanese or Japanese to English follow the below steps:
 

1. Go to TIBCO_Data_Virtualization_Install_Directory>bin folder.

2. Open the Studio.bat file with an editor like notepad++.

3. Add  line "-Duser.language=ja -Duser.country=JP" after "%VM_ARGS%" option as shown below:
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- :JAVA_OPTIONS

set JAVA_OPTS=%VM_ARGS% -Duser.language=ja -Duser.country=JP -Djava.library.path="%CONF_INSTALL_DIR%\%JNI_LIB_PATH%" -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="%CONF_INSTALL_DIR%\logs" -Djava.endorsed.dirs="%COMMON_ENDORSED_DIR%" -Dsun.java2d.noddraw=true -Dfile.encoding="UTF-8" -Dlog4j.configuration="%CONF_INSTALL_DIR%\conf\studio\log4j.properties" %MIN_MEMORY% %MAX_MEMORY%
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4. Save the file and restart TIBCO Data Virtualization Studio.

To change the language again to English remove the "-Duser.language=ja -Duser.country=JP" line after this Save the file and restart TIBCO Data Virtualization Studio.

 

If removing the line doesn't work to change the language to English then add the line "-Duser.language=en -Duser.country=US" after this save the file and restart TIBCO Data Virtualization Studio.