Finished Android samples renaming

samples/android/tutorial-4-mixed/.project

 <?xml version="1.0" encoding="UTF-8"?>
 <projectDescription>
-	<name>Tutorial 2 Advanced - 2. Mix Java\Native OpenCV</name>
+	<name>Tutorial 2 Advanced - 2. Mix Java+Native OpenCV</name>
 	<comment></comment>
 	<projects>
 	</projects>

samples/android/tutorial-4-mixed/res/values/strings.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">Tutorial 2 Advanced - 2. Mix Java\Native OpenCV</string>
+    <string name="app_name">Tutorial 2 Advanced - 2. Mix Java+Native OpenCV</string>
 </resources>