To change language on linux terminal to English, run

export LC_ALL=C

or

export LC_ALL=en_US.UTF-8

Here i run a command on linux server with German language

root@kauz ~ # nmap localhost
-bash: nmap: Kommando nicht gefunden.
root@kauz ~ # export LC_ALL=C
root@kauz ~ # nmap localhost
-bash: nmap: command not found
root@kauz ~ # 

After running export LC_ALL=C, all command result will be displayed in English.

You can verify the language settings with locale command

root@kauz ~ # locale
LANG=de_DE.UTF-8
LANGUAGE=
LC_CTYPE="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_COLLATE="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHONE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=C
root@kauz ~ # 

Making Language Change permanent

To make language change permanant, you can edit

vi /etc/default/locale

Add

LANG="en_US"
LANGUAGE="en_US:en"

• locale: Cannot set LC_CTYPE to default locale: No such file or directory