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)

For information about installation of Farsi fonts and Vim usage in Farsi mode,
refer to the Farsi help file by typing ":help farsi" in Vim.