I'm stumped as to why, but, since I first tried it a long time ago on macOS up to just now with version 1.4.0 running on macOS Sonoma 14.5, it opens up in Japanese locale. Coincidentally I do read some Japanese but since most of the terms are actually just transliterated English, I'd rather see the UI in English (which happens to be the configured locale).
Is your system language Japanese? You can change the language in the settings. Click on the gear button and then "Application Settings" and there under the "General" section
I'm stumped as to why, but, since I first tried it a long time ago on macOS up to just now with version 1.4.0 running on macOS Sonoma 14.5, it opens up in Japanese locale. Coincidentally I do read some Japanese but since most of the terms are actually just transliterated English, I'd rather see the UI in English (which happens to be the configured locale).