Change menu/ui language of vim to english

I search on google and I read several answers but I am unable to change the menu/ui language of vim to english.

Im my .vimrc I have

set langmenu=en_US.UTF-8
language messages en_US.UTF-8

but it doesn't work, vim uses the default language of my system.

I tried

set langmenu=none

but it's the same.

locale en_US.UTF-8 is installed.

I am using vim 7.4 on ubuntu.

Thanks for the help.

My native language is Chinese and I use Windows 7. I tried to do this like you did before, finally I tried to writing the following in _vimrc file and it worked for me.

set langmenu=en_US
let $LANG = 'en_US'
source $VIMRUNTIME/delmenu.vim
source $VIMRUNTIME/menu.vim

In case of Gvim it is quite simple to change the language of the gui part of gvim

Go to C:\Program Files (x86)\Vim\vim74\lang
and remove all folders... and restart gvim then it will open in English...

It works for me to simply add one line

language en_US.utf8

at the top of .vimrc.

Since en_US.utf8 is the output of you $ locale -a command, you should use

language en_US.utf8

instead of

language en_US.UTF-8