I have the translation for the Gemini and Imagen string now because that is in the connectors.php file, but the JSON translations are not used yet.
All Japanese string translations for WordPress 7.0 have been completed, including those related to connectors.
The strings have the __() function, and the script requests the i18n package.
The script module includes some translations:
<script id="wp-script-module-data-options-connectors-wp-admin" type="application/json">
{"connectors":{"anthropic":{"name":"Anthropic","description":"Claude を使用したテキスト生成。","logoUrl":null,"type":"ai_provider","authentication":{"method":"api_key","settingName":"connectors_ai_anthropic_api_key","credentialsUrl":"https://platform.claude.com/settings/keys","keySource":"none","isConnected":false},"plugin":{"file":"ai-provider-for-anthropic/plugin.php","isInstalled":false,"isActivated":false}},"google":{"name":"Google","description":"Gemini と Imagen による、テキストおよび画像の生成。","logoUrl":null,"type":"ai_provider","authentication":{"method":"api_key","settingName":"connectors_ai_google_api_key","credentialsUrl":"https://aistudio.google.com/api-keys","keySource":"none","isConnected":false},"plugin":{"file":"ai-provider-for-google/plugin.php","isInstalled":false,"isActivated":false}},"openai":{"name":"OpenAI","description":"GPT と Dall-E による、テキストおよび画像の生成。","logoUrl":null,"type":"ai_provider","authentication":{"method":"api_key","settingName":"connectors_ai_openai_api_key","credentialsUrl":"https://platform.openai.com/api-keys","keySource":"none","isConnected":false},"plugin":{"file":"ai-provider-for-openai/plugin.php","isInstalled":false,"isActivated":false}}}}
</script>
I remember having a similar issue earlier with strings in JavaScript when using trunk or beta/RC, and I think it resolved itself in the general release. However, this might need to assign the translations for the script module.