in at least "c_sharp_collections.rst", there are many method names that should not be "translated"

**Your Godot version:**
will not matter

**Issue description:**

I am translating Godot and its documentation to Turkish. It is good thing Weblate lets us see where a string belongs.

There I can see a lot of language leywords slipped into translation queue, but these has to be kept as is because they are keywords.

One file containing such words is this: https://github.com/godotengine/godot-docs/blob/master/contributing/documentation/docs_writing_guidelines.rst

The number of such keyword strings are not small, and it is easy for translators to miss this detail and ruin the programming experience.

Please find a way to fix such issues.

**URL to the documentation page (if already existing):**
At least the one above