Remove unused and duplicate strings

Change-Id: I7e1a3120e66ca8bc3adab65499663fecb5b041a3
diff --git a/res/layout-sw600dp/title_bar_nav.xml b/res/layout-sw600dp/title_bar_nav.xml
index b108f33..d8935b3 100644
--- a/res/layout-sw600dp/title_bar_nav.xml
+++ b/res/layout-sw600dp/title_bar_nav.xml
@@ -128,7 +128,7 @@
         android:id="@+id/all_btn"
         style="@style/NavButton"
         android:layout_width="wrap_content"
-        android:contentDescription="@string/accessibility_button_bookmarks"
+        android:contentDescription="@string/bookmarks"
         android:scaleType="center"
         android:src="@drawable/ic_deco_bookmarks_normal" />