fa: Translate Part 3 , 4 , 5 ,6.1, 6.2, 6.3

[moaminsharifi]

Part of #671
Summary of changes:

• Translate Part 3 , 4 , 5 ,6.1, 6.2, 6.3
  for making easier for Reviewers, I just translate until #: src/basic-syntax/references.md:3

I manage to handle all of ltr textes between in rtl texts which have bidi issue:

for example:

• ++C instead of C++
• !println instead of println!
  
  Or:

which is so messy in the table, and now is:

Thanks to @mgeisler for checking and merging pull request #1433, the changes have greatly improved BiDi in the project.

[prmadev]

Could not go further than line 2426 at the moment. But for now, here are some of my comments.

[DannyRavi]

Thanks to @moaminsharifi for translating some of the texts.

[hamidrezakp]

Sorry for the size of comments, a lot of them are ZWNJ's.

Thank you again, great work.

[hamidrezakp]

LGTM!