add a few closes tags to Acquire::Translation changelog

debian/changelog

@@ -19,6 +19,7 @@ apt (0.7.25) UNRELEASED; urgency=low
   [ David Kalnischkies ]
    * [BREAK] add possibility to download and use multiply
      Translation files, configurable with Acquire::Translation
+     (Closes: #444222, #448216, #550564)
   * apt-pkg/packagemanager.cc:
     - better debug output for ImmediateAdd with depth and why
     - improve the message shown for failing immediate configuration