Look for:
App\PhotoshopCS6\Locales\ (or similar, depending on your portable build). adobe photoshop cs6 portable language change to english link
Inside Locales , you will see a folder named after your current language (e.g., ru_RU for Russian, es_ES for Spanish, or jp_JP for Japanese). Look for: App\PhotoshopCS6\Locales\ (or similar
If your portable version includes multiple pre-installed language packs, you might find a setting within the interface: How to change Photoshop Language to English! ru_RU for Russian