Diffusion GpgOL 59e8a7ee3bcd

Use dispcache for Multilanguage COM interface

Authored by aheinecke on Aug 29 2018, 10:30 AM.

Description

Use dispcache for Multilanguage COM interface

* src/dialogs.h (DISPID_MULTILANG): New.
* src/mlang-charset.cpp (ansi_charset_to_utf8): Use dispcache.

Using CoCreateInstance for every string to convert seemed excessive
so we better cache it.