Also:
* Removed deprecated code that remains in `extract_editor.py` after the
script split
* Fixed borken remap extraction due to our migration from
`String::utf8("text")` to `U"text"`
We use a git submodule to handle updating the POT templates.
The translations were synced with the last 3.5 state from Jan 20,
then merged and updated with Feb 7 sources for 4.0.
The editor translations are split into editor interface (`editor`)
and properties (`properties`) resources, following:
https://github.com/godotengine/godot/pull/70623
