Link to Wikipedia entry of ��коледа

For the people who are unfamiliar with the cyrillic alphabet.

docs/announce/2015.12.md

@@ -9,7 +9,7 @@ This is the Christmas release of Rakudo Perl 6. This version of the compiler
 targets the v6.c “Christmas” specification of the Perl 6 language. The
 Perl 6 community has been working toward this release over the last 15 years.
 
-The tag for this release is “коледа”, a slavic word for an ancient winter
+The tag for this release is “коледа”[^2], a slavic word for an ancient winter
 festival that has been incorporated into Christmas. We hope you join us
 in our celebration of getting our Christmas release shipped!
 
@@ -21,7 +21,7 @@ also continue our work on the specification, with feedback from the community.
 The tarball for this release is available from <http://rakudo.org/downloads/rakudo/>.
 
 Please note: This announcement is not for the Rakudo Star
-distribution[^2] --- it’s announcing a new release of the compiler
+distribution[^3] --- it’s announcing a new release of the compiler
 only. For the latest Rakudo Star release, see
 <http://rakudo.org/downloads/star/>.
 
@@ -277,7 +277,9 @@ us through (the above-mentioned) mailing list or IRC channel. Enjoy!
 
 [^1]: See <http://moarvm.org/>
 
-[^2]: What’s the difference between the Rakudo compiler and the Rakudo
+[^2]: See <https://en.wikipedia.org/wiki/Koliada>
+
+[^3]: What’s the difference between the Rakudo compiler and the Rakudo
 Star distribution?
 
 The Rakudo compiler is a compiler for the Perl 6 language.