kernel32: add a stub for GetThreadUILanguage

[Austin English]

For http://bugs.winehq.org/show_bug.cgi?id=24246

-- 
-Austin
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diff --git a/dlls/kernel32/kernel32.spec b/dlls/kernel32/kernel32.spec
index 4cb4f96..8a33013 100644
--- a/dlls/kernel32/kernel32.spec
+++ b/dlls/kernel32/kernel32.spec
@@ -658,6 +658,7 @@
 @ stdcall GetTimeFormatA(long long ptr str ptr long)
 @ stdcall GetTimeFormatW(long long ptr wstr ptr long)
 @ stdcall GetTimeZoneInformation(ptr)
+@ stdcall GetThreadUILanguage()
 @ stdcall GetUserDefaultLCID()
 @ stdcall GetUserDefaultLangID()
 @ stdcall GetUserDefaultLocaleName(ptr long)
diff --git a/dlls/kernel32/thread.c b/dlls/kernel32/thread.c
index 024e825..54aa762 100644
--- a/dlls/kernel32/thread.c
+++ b/dlls/kernel32/thread.c
@@ -777,3 +777,21 @@ DWORD WINAPI GetThreadErrorMode( void )
 {
     return rtlmode_to_win32mode( RtlGetThreadErrorMode() );
 }
+
+/***********************************************************************
+ *              GetThreadUILanguage (KERNEL32.@)
+ *
+ * Get the current thread's language identifier.
+ *
+ * PARAMS
+ *  None.
+ *
+ * RETURNS
+ *  The current thread's language identifier.
+ */
+LANGID WINAPI GetThreadUILanguage( void )
+{
+    FIXME(": stub, returning LOCALE_USER_DEFAULT.\n");
+    return LOCALE_USER_DEFAULT;
+}
+