title: Android Studio(v 2.1.3) doesn't recognize strings.xml as resource file
body: <p>Unfortunately, Android Studio's stopped recognize strings.xml file as resource file for all my projects. So now each string, which declares in strings.xml, in the source code emphasizes with red line.</p>
  
  <p>Renaming of strings.xml file or reinstalling Android Studio fixes this problem, but I hope exist another solution.</p>