Refine remove locale warning dialog string

- If the first language is not selected, just remove the body copy
  else warning user the locale will change to another language.

Fixes: 140723349
Test: manual & robotest
Change-Id: I9fec17ae85889f2864c3f3cae744f7181e6f9b2c

src/com/android/settings/localepicker/LocaleDragAndDropAdapter.java

@@ -251,6 +251,10 @@ class LocaleDragAndDropAdapter
         return result;
     }
 
+    boolean isFirstLocaleChecked() {
+        return mFeedItemList != null && mFeedItemList.get(0).getChecked();
+    }
+
     void addLocale(LocaleStore.LocaleInfo li) {
         mFeedItemList.add(li);
         notifyItemInserted(mFeedItemList.size() - 1);