python: Replace usages of Python2-only import __builtin__ with a Python 3 compatible equivalent

[echoix]

Fixes #3328

I took the approach of setting in the dict, as tools like Pyright complain (rightfully), that _ isn't a know builtin. It's true, its something a bit more dynamic. That's about what we use for the normal translations in

grass/python/grass/__init__.py

Line 19 in 5e86482

import builtins as _builtins

grass/python/grass/__init__.py

Lines 97 to 101 in 5e86482

	# Initialize the translation attribute of the translate function to indicate
	# that the translations are not initialized.
	_translate.translation = None
	_builtins.__dict__["_"] = _translate

Addressed sugestions to not keep older aliased name

[echoix]

Ready to review

[ninsbl]

Looks fine, but I wonder: why didn't it fail? Is this dead code?
Or is it wrapped in other Python 2/3 compatibility code that could be removed?

[echoix]

Looks fine, but I wonder: why didn't it fail? Is this dead code? Or is it wrapped in other Python 2/3 compatibility code that could be removed?

It's simple: It isn't touched in any of the pytest or gunittest tests that run in the ubuntu and pytest workflows. If you want to explore a bit on the covered lines in what will be an upcoming PR, once I'm satisfied with the config, you can explore here: https://app.codecov.io/gh/echoix/grass

You can see that nothing in the gui folder is touched (it isn't even showing up yet).

Edit: when I mean touched, it's because I didn't limit yet to only tests or only tests that asserts. It also includes what is read when compiling (but partially, C code probably yes, but I don't think I ended up including Python in that set)