Decode locale-encoded descriptions.

The translated description returned by libapt-pkg is, unlike other
fields, locale-encoded (see apt-pkg/deb/debrecords.cc). As such, try
decoding that description with the current locale.

python/generic.h

@@ -31,6 +31,7 @@
 #include <string>
 #include <iostream>
 #include <new>
+#include <langinfo.h>
 
 /**
  * Exception class for almost all Python errors
@@ -220,6 +221,12 @@ inline PyObject *CppPyString(const char *Str)
    return PyString_FromString(Str);
 }
 
+inline PyObject *CppPyLocaleString(const std::string &Str)
+{
+   char const * const codeset = nl_langinfo(CODESET);
+   return PyUnicode_Decode(Str.c_str(), Str.length(), codeset, "replace");
+}
+
 #if PY_MAJOR_VERSION >= 3
 static inline PyObject *CppPyPath(const std::string &path)
 {

python/pkgrecords.cc

@@ -127,7 +127,7 @@ static PyObject *PkgRecordsGetShortDesc(PyObject *Self,void*) {
 }
 static PyObject *PkgRecordsGetLongDesc(PyObject *Self,void*) {
    PkgRecordsStruct &Struct = GetStruct(Self,"LongDesc");
-   return (Struct.Last != 0) ? CppPyString(Struct.Last->LongDesc()) : 0;
+   return (Struct.Last != 0) ? CppPyLocaleString(Struct.Last->LongDesc()) : 0;
 }
 static PyObject *PkgRecordsGetName(PyObject *Self,void*) {
    PkgRecordsStruct &Struct = GetStruct(Self,"Name");