Change 'Favorite/Unfavorite' item menu to 'Set/Unset as available offline'

res/values/strings.xml

@@ -230,8 +230,8 @@
 	<string name="auth_can_not_auth_against_server">Cannot authenticate to this server</string>
     <string name="auth_account_does_not_exist">Account does not exist in the device yet</string>
     
-    <string name="favorite">Favorite</string>
-    <string name="unfavorite">Unfavorite</string>
+    <string name="favorite">Set as available offline</string>
+    <string name="unfavorite">Unset as available offline</string>
     <string name="common_rename">Rename</string>
     <string name="common_remove">Remove</string>
     <string name="confirmation_remove_alert">"Do you really want to remove %1$s?"</string>