po: Update Basque programs translation

Closes: #771893
Signed-off-by: Guillem Jover <guillem@debian.org>

debian/changelog

@@ -1,6 +1,7 @@
 dpkg (1.17.23) UNRELEASED; urgency=low
 
   [ Updated programs translations ]
+  * Basque (Iñaki Larrañaga Murgoitio). Closes: #771893
   * Czech (Miroslav Kure).
   * French (Sébastien Poher).
   * Italian (Milo Casagrande).