Output non-ascii characters through wall command

Question

Using Linux Slackware 14.2, KDE. I created a script in Linux with Russian text that I want to output through wall:

#!/bin/bash
wall <<< 'Сообщение'

Instead of text I see the characters codes:

\320\241\320\276\320\276\320\261\321\211\320\265\320\275\320\270\320\265

I added to ~/.bashrc:

locale=C_UTF8

Then did:

$ source ~/.bashrc

But it didn't work. How to fix this?