Add a name for the My Tracks Importer

because when open a GPX file using
the Linda File Manager, three My Tracks
activities show up.

ImportActivity (My Tracks Importer)
MyTracks (My Tracks)
WaypointDetails (Marker details)

MyTracks/AndroidManifest.xml

@@ -142,6 +142,7 @@ limitations under the License.
     </activity>
 
     <activity android:name="com.google.android.apps.mytracks.io.file.ImportActivity"
+              android:label="@string/my_tracks_importer"
               android:theme="@android:style/Theme.Translucent.NoTitleBar"
               android:noHistory="true">
       <intent-filter>

MyTracks/res/values/strings.xml

@@ -1019,6 +1019,13 @@ limitations under the License.
     translation_description="The My Tracks application name.">
       My Tracks
   </string>
+  <string name="my_tracks_importer"
+    translation_description="When opening a GPX file from a file manager, the name of the My Tracks
+      application that can import the file to My Tracks.
+
+      Screenshot: my_tracks_importer.png">
+      My Tracks Importer
+  </string>
   <string name="my_tracks_recording_service"
     translation_description="When viewing the 'Running services' on Android, the name of the My
       Tracks service that is recording a track in the background.