Help with languages

Guys, i have a problem with i3wm. My xterm if white and as far as i understood it tries to render russian lang but doesnt have it.

How can i fix this? What is the easiest way to add eng and ru languages? Can u recommend me some sources to get involved into i3wm, endeavor as a total newbie?

welcome to the purple cruise :enos:

As i3WM is not a full Desktop (Window Manager) most things will get handled systemwide over default tools.

Also default Terminal on EndeavourOS i3WM is xfce4-terminal and it should follow what you set on the installer for keymap and language. But indeed in cases it can be wrong to as of installer not always 100% correctly detects it automatically, and you may not correct that on the installer slide for keyboard and language settings.

https://wiki.archlinux.org/title/Locale

run locale in a terminal will show what is set currently.
localectl shows keymap too..

@cascadeoftears ,
cat .Xresources

!# File : .Xresources
Xcursor.theme: Qogir-dark
Xcursor.size: 20

xterm*faceName: Monospace
xterm*faceSize: 16
xterm*faceSize1: 8
xterm*faceSize2: 10
xterm*faceSize3: 12
xterm*faceSize4: 14
xterm*faceSize5: 16
xterm*faceSize6: 18

XTerm*background: #2d2d2d
XTerm*foreground: white
XTerm*pointerColor: red
XTerm*pointerColorBackground: black
XTerm*cursorColor: green
XTerm*internalBorder: 3
XTerm*loginShell: true
XTerm*scrollBar: false
XTerm*scrollKey: true
XTerm*saveLines: 1000
XTerm*multiClickTime: 250

xrdb load .Xresources
or reboot

Insert / uncomment a line like this in ~/.config/i3/config
exec --no-startup-id "setxkbmap -layout us,ru -option 'grp:alt_shift_toggle'"

we have this in the confog too

Mea culpa. I searched but forgot the pattern. And was busy moderating myself to ask where OP lives.

no regrets .. good that you pointed to this.