How do I change the display language of Astah from English to Japanese (or vice versa)?

There are two ways to change the display language in Astah products.

Option 1: Change OS Language Settings

Astah automatically detects your Operating System's language.

• To display in Japanese: Set your OS language to Japanese.

• To display in English: Set your OS language to any language other than Japanese.

Option 2: Modify Property Settings (Recommended)

If you do not want to change your entire OS language, you can force Astah to use a specific language by following these steps:

For Windows Users

1. Close Astah if it is running.

2. Go to the Astah Installation folder and open the .ini file corresponding to your product with a text editor (e.g., Notepad):

   • Astah Professional: astah-pro.l4j.ini

   • Astah UML: astah-uml.l4j.ini

   • Astah SysML: astahsysml.l4j.ini

   • Astah System Safety: astahsystemsafety.l4j.ini

3. Add the following lines to the bottom of the file:

   • To force Japanese:

     -Duser.language=ja

     -Duser.country=JP
     

   • To force English: Look for the line #-Duser.language=en, remove the # symbol, and ensure it reads:

     -Duser.language=en
     

4. Save the file and restart Astah.

For macOS Users

1. Close Astah if it is running.

2. Open Terminal and execute the command for your specific version (example below is for Professional):

   • To force Japanese:

     defaults write com.change-vision.astah.professional /com/change-vision/astah/professional/ -dict-add JVMOptions/ '{ "language" = "-Duser.language=ja"; "country" = "-Duser.country=JP"; }'
     

   • To force English:

     defaults write com.change-vision.astah.professional /com/change-vision/astah/professional/ -dict-add JVMOptions/ '{ "language" = "-Duser.language=en"; }'
     

3. Restart Astah.