Upgraded to Xcode 4.4 today, and when clicking on my strings file and looking in the Utilities window, I no longer see a plus button allowing me to add a new language.
The +/- was removed starting in Xcode 4.4. The way to add localizations is to go to your project settings pane (The same place where you would change the build settings of your project) and click on your project name under the Project heading. You can then add localizations in the Localizations section.