docs: added all english translated docs in reference as folder

[jmoldyvan]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• docs update
• add docs folder "reference" to english translation

• What is the current behavior? (You can also link to an open issue here)

• no change

• What is the new behavior (if this is a feature change)?

• no change

[lumianph]

thanks @jmoldyvan that is a generous gift for the community!
We will look through the docs asap.

[lumianph]

@jmoldyvan as it contains too many files, after I take a quick look, most contents are quite satisfied. So I have decided to merge this PR to the main branch first. Then we will fix some typos one by one by having separate PRs.