debian: Add liblocale-gettext-perl to libdpkg-perl Recommends

The Dpkg::Gettext module makes conditional usage of this module, so
we should Recommend it to give the user a chance to get it installed.

debian/changelog

@@ -1,6 +1,8 @@
 dpkg (1.18.11) UNRELEASED; urgency=medium
 
   [ Guillem Jover ]
+  * Packaging:
+    - Add liblocale-gettext-perl to libdpkg-perl Recommends.
   * Documentation:
     - Update custom changelog parser API support status in README.api.
     - Fix typos in docs and man pages. Thanks to Jakub Wilk <jwilk@debian.org>

debian/control

@@ -77,7 +77,11 @@ Priority: optional
 Architecture: all
 Multi-Arch: foreign
 Depends: dpkg (>= 1.16.3), perl, ${misc:Depends}
-Recommends: libfile-fcntllock-perl, bzip2, xz-utils
+Recommends:
+ libfile-fcntllock-perl,
+ liblocale-gettext-perl,
+ bzip2,
+ xz-utils,
 Suggests: debian-keyring, gnupg | gnupg2, gpgv | gpgv2,
  gcc | c-compiler, binutils, patch
 Breaks: dpkg-dev (<< 1.15.6), patch (<< 2.7)