Fix: "manpath: can't set the locale; make sure $LC_* and $LANG are correct"

manpath-wrong

## Problem 
When login in, the shell prints:
```
manpath: can't set the locale; make sure $LC_* and $LANG are correct
```

## Solution
```
sudo locale-gen "en_US.UTF-8"
sudo dpkg-reconfigure locales
sudo echo "LC_ALL=\"en_US.UTF-8\"" >> /etc/default/locale
```

Theese commands should be ran in the client or the server machine?

@Vichoko I've run these commands on the server where this problem exists and it works for me.