Eleven: Re-add ability to change artist image and album art

https://cyanogen.atlassian.net/browse/MUSIC-61

Change-Id: Id839ea2df1b7a5dd7729ae584ecd72af30f975ee
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 4815376..9ca8ab1 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -107,6 +107,7 @@
     <string name="context_menu_remove_from_recent">Remove from recent</string>
     <string name="context_menu_use_as_ringtone">Use as ringtone</string>
     <string name="context_menu_remove_from_playlist">Remove from playlist</string>
+    <string name="context_menu_change_image">Change image</string>
 
     <!-- Content descriptions -->
     <string name="accessibility_play">Play</string>