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)
SECURITY: Don't parse usernames as wikitext

On Special:PasswordReset, don't parse the username as wikitext since
the wikitext is parsed according to the wiki's configuration (might
include wgRawHtml), and the wiki may be private.

Bug: 65501
Change-Id: Ic3e5d42e1be5acc42ba89ae853c5ecbfec04fa91
Updated release notes and version number for MediaWiki 1.21.10

This is MediaWiki 1.21.10 security and maintenance release.

Change-Id: If72f1d29771f7a02c3eedee871d1dd0040abd317
Merge branch 'REL1_21' of https://gerrit.wikimedia.org/r/p/mediawiki/core into REL1_21