patch 8.0.0175: setting language on MS-Windows does not always work commit https://github.com/vim/vim/commit/972c3b8f1b50e2f887a397c324af99eb354aad0b Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 12 21:44:49 2017 +0100 patch 8.0.0175: setting language on MS-Windows does not always work Problem: Setting language in gvim on MS-Windows does not work when libintl.dll is dynamically linked with msvcrt.dll. Solution: Use putenv() from libintl as well. (Ken Takata, closes #1082)

--- a/src/misc1.c
+++ b/src/misc1.c
@@ -4455,6 +4455,9 @@ vim_setenv(char_u *name, char_u *val)
     {
 	sprintf((char *)envbuf, "%s=%s", name, val);
 	putenv((char *)envbuf);
+# ifdef libintl_putenv
+	libintl_putenv((char *)envbuf);
+# endif
     }
 #endif
 #ifdef FEAT_GETTEXT