removed the hard coded string (commons-app#3015)

* removed the hard coded string

* fix

Author: sherlockbeard

app/src/main/java/fr/free/nrw/commons/media/MediaDetailFragment.java

@@ -392,7 +392,7 @@ public void onDeleteButtonClicked(){
         //            enableDeleteButton(true);   makes sense ?
         else{
         AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
-        alert.setMessage("Why should "+ media.getDisplayTitle() +"  be deleted?");
+        alert.setMessage(getString(R.string.dialog_box_text_nomination,media.getDisplayTitle()));
         final EditText input = new EditText(getActivity());
         alert.setView(input);
         input.requestFocus();

app/src/main/res/values/strings.xml

@@ -554,4 +554,5 @@ Upload your first media by tapping on the add button.</string>
   <string name="share_text">Upload photos to Wikimedia Commons on your phone Download the Commons app: %1$s</string>
   <string name="share_via">Share app via...</string>
   <string name="image_info">Image Info</string>
+  <string name="dialog_box_text_nomination">Why should %1$s be deleted?</string>
 </resources>