This is the safest, fastest, and fully automatic method. Adobe verifies the files on their CDN before you ever see them.
To download and install a verified language pack for Adobe Photoshop, you must use the official Adobe Creative Cloud Desktop app photoshop language pack download verified
Disguised .exe or .dmg installers frequently contain malicious code that can compromise your personal data. This is the safest, fastest, and fully automatic method
Go to Edit > Preferences > Interface (Windows) or Photoshop > Preferences > Interface (macOS). This is the safest
Before extracting or running any installer, scan it with an up-to-date antivirus program. How to Switch Languages After Installation
Adobe Help: Change language settings - Official guide on switching languages.