Remove "Android App:" when sharing an application

Reasons to do so:
* Redundant
* Often noisy
* Not properly translated

src/org/fdroid/fdroid/AppDetails.java

@@ -927,7 +927,7 @@ public class AppDetails extends ListActivity {
         Intent shareIntent = new Intent(Intent.ACTION_SEND);
         shareIntent.setType("text/plain");
 
-        shareIntent.putExtra(Intent.EXTRA_SUBJECT, "Android App: "+app.name);
+        shareIntent.putExtra(Intent.EXTRA_SUBJECT, app.name);
         shareIntent.putExtra(Intent.EXTRA_TEXT, app.name+" ("+app.summary+") - https://f-droid.org/app/"+app.id);
 
         startActivity(Intent.createChooser(shareIntent, getString(R.string.menu_share)));