Tabs show up as tab_content, tab_presentation..
All of the text on my admin pages shows up as short phrases with underscores (tab_content, advanced_options, etc)
This happens when there is no language installed. (Perhaps you encountered an error during the setup process?)
Go to tab_admin > tab_preferences, manage_languages, then install or update the appropriate language.
If the language is installed correctly and the problem persists, try switching to a different language and back.