“We’ve localized Periscope for Web to support 33 languages. If you watch broadcasts in a browser and you see a different language, you may need to change your browser settings. Here’s how:
Internet Explorer. When you install a copy of Internet Explorer version, your preferences are automatically set based on your Windows settings.
To change your language preferences go to Tools > Internet Options > General (tab) > Languages > Language preference.
Firefox. To change your language preferences go to Tools > Options (Windows) or Firefox > Preferences(Mac OS X), and select Content (tab) > Languages > Choose (button).
Safari. On Mac OS X the language is specified in the OS X system language preferences. To change those preferences go to System Preferences > Language & text > Language.
Google Chrome. To change your language preferences go to Options (Windows) or Chrome > Preferences (Mac OS X), and select Show Advanced Settings > Languages
Opera. On Windows you can change your language preferences at Menu > Settings > Preferences > General > Language > Details (button).”