Add Ukrainian and Russian localisations

[Vovkiv]

I unable to test translations for editor because I can't even run project, it throws error:

Trying to assign value of type 'Nil' to a variable of type 'Dictionary'.

in

0 - res://ui/editor_window/editor_layout.gd:18 - at function load_editor_layout
1 - res://ui/editor_window/editor_layout.gd:7 - at function _ready

this line:

var data: Dictionary = data_file.get_var()

But since there not much strings to begin with and they are generic enough, I don't think I translated something THAT wrong.

However, I tested startup window and there everything should be fine.

Also, it's not related to pull, but adding information in readme file about what version of Godot currently used in project will be quite handy, especially for someone like me who jumps to more up-to-date builds of Godot rather then staying on stable versions.

[voylin]

Thank you for the translations!

At this moment the editor is still under very heavy development and it is possible that the current uploaded stuff does not work as I am working on many things at the moment which will each get uploaded separately. The Alpha is supposed to be out around February so it will still take some time before we have an actual working editor.

During alpha we will be going through the translations and many strings will get added as adding translation strings is not a priority right now.

I'll add your name to the language contributor list and merge this pull request. ;)