Update Thai program translation

Closes: #745032

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

debian/changelog

@@ -3,6 +3,7 @@ dpkg (1.17.7) UNRELEASED; urgency=low
   [ Updated dpkg translations ]
   * German (Sven Joachim).
   * Swedish (Peter Krefting).
+  * Thai (Theppitak Karoonboonyanan). Closes: #745032
   * Vietnamese (Trần Ngọc Quân).
 
   [ Updated scripts translations ]