Remove unused and duplicate strings

Change-Id: I7e1a3120e66ca8bc3adab65499663fecb5b041a3
diff --git a/res/layout/download_settings.xml b/res/layout/download_settings.xml
index 2797239..d678713 100644
--- a/res/layout/download_settings.xml
+++ b/res/layout/download_settings.xml
@@ -186,7 +186,7 @@
             android:layout_gravity="end"
             android:layout_weight="1"
             android:maxLines="1"
-            android:text="@string/download_cancel" />
+            android:text="@string/cancel" />
 
         <Button
             android:id="@+id/download_start"
@@ -196,7 +196,7 @@
             android:layout_gravity="start"
             android:layout_weight="1"
             android:maxLines="1"
-            android:text="@string/download_start" />
+            android:text="@string/ok" />
     </LinearLayout>
 
 </LinearLayout>