How to fix locale in Ubuntu (questions marks)

I have faced this problem when moved my account from one Ubuntu PC to another, so I think problem has been appeared due to the version conflict

The first result when I have typed locale was

LANG=en_US
LANGUAGE=
LC_CTYPE="en_US
LC_NUMERIC="en_US
LC_TIME="en_US
LC_COLLATE="en_US
LC_MONETARY="en_US
LC_MESSAGES="en_US
LC_PAPER="en_US
LC_NAME="en_US
LC_ADDRESS="en_US
LC_TELEPHONE="en_US
LC_MEASUREMENT="en_US
LC_IDENTIFICATION="en_US
LC_ALL=en_US
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