Remove unused and duplicate strings

Change-Id: I7e1a3120e66ca8bc3adab65499663fecb5b041a3
diff --git a/res/xml/bandwidth_preferences.xml b/res/xml/bandwidth_preferences.xml
index a31d0e8..b7f26f9 100644
--- a/res/xml/bandwidth_preferences.xml
+++ b/res/xml/bandwidth_preferences.xml
@@ -20,17 +20,17 @@
         android:key="preload_when"
         android:title="@string/pref_data_preload_title"
         android:summary="@string/pref_data_preload_summary"
-        android:entries="@array/pref_data_preload_choices"
+        android:entries="@array/pref_temporal_choices"
         android:entryValues="@array/pref_data_preload_values"
-        android:dialogTitle="@string/pref_data_preload_dialogtitle" />
+        android:dialogTitle="@string/pref_data_preload_title" />
 
     <ListPreference
         android:key="link_prefetch_when"
         android:title="@string/pref_link_prefetch_title"
         android:summary="@string/pref_link_prefetch_summary"
-        android:entries="@array/pref_link_prefetch_choices"
+        android:entries="@array/pref_temporal_choices"
         android:entryValues="@array/pref_link_prefetch_values"
-        android:dialogTitle="@string/pref_link_prefetch_dialogtitle" />
+        android:dialogTitle="@string/pref_link_prefetch_title" />
 
     <SwitchPreference
         android:key="load_images"