po: Use PACKAGE_BUGREPORT instead of literal project address

dselect/po/Makevars

@@ -36,7 +36,7 @@ COPYRIGHT_HOLDER = Software in the Public Interest, Inc.
 # It can be your email address, or a mailing list address where translators
 # can write to without being subscribed, or the URL of a web page through
 # which the translators can contact you.
-MSGID_BUGS_ADDRESS = debian-dpkg@lists.debian.org
+MSGID_BUGS_ADDRESS = $(PACKAGE_BUGREPORT)
 
 # This is the list of locale categories, beyond LC_MESSAGES, for which the
 # message catalogs shall be used.  It is usually empty.

po/Makevars

@@ -37,7 +37,7 @@ COPYRIGHT_HOLDER = Software in the Public Interest, Inc.
 # It can be your email address, or a mailing list address where translators
 # can write to without being subscribed, or the URL of a web page through
 # which the translators can contact you.
-MSGID_BUGS_ADDRESS = debian-dpkg@lists.debian.org
+MSGID_BUGS_ADDRESS = $(PACKAGE_BUGREPORT)
 
 # This is the list of locale categories, beyond LC_MESSAGES, for which the
 # message catalogs shall be used.  It is usually empty.

scripts/po/Makevars

@@ -36,7 +36,7 @@ COPYRIGHT_HOLDER = Software in the Public Interest, Inc.
 # It can be your email address, or a mailing list address where translators
 # can write to without being subscribed, or the URL of a web page through
 # which the translators can contact you.
-MSGID_BUGS_ADDRESS = debian-dpkg@lists.debian.org
+MSGID_BUGS_ADDRESS = $(PACKAGE_BUGREPORT)
 
 # This is the list of locale categories, beyond LC_MESSAGES, for which the
 # message catalogs shall be used.  It is usually empty.