Add space between two feed links

When more than one feed link was given, the links was concat without a
space, which looks odd. Adding now a space, between each link in the
toolbox.

Bug: 36356
Change-Id: Iaf61c88dde0a92c475a60c005e13222eb7618eef
(cherry picked from commit 853877f93af5056dc3162a7fc83957681674ca0c)