It says "Nelze najít text k předčitání" which means that no text to be read was found. Just a small beta error I guess ;)
How do you know that it is meaning to "Whose tree is it?" instead of "Whose is that tree?"
THIS is TENTO or TENHLE. It is an object that is right here, i can touch it.
"This" and "That" in English tends to indicate distance from speaker. Does Czech hold the same meaning in the case of "ten" vs. "tento/tenhle"?
It was a missing translation case. The difference is so minimal, if any, that it should be considered the same