git-clone: update page and add Dutch translation

[dmmqz]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[sebastiaanspeck]

I also wonder if we can come up with a better alternative for "Kloon".

[dmmqz]

I think "kloon" is fine. Maybe @leonvsc has an alternative.

[leonvsc]

Tbh, I think “kloon” is fine. If we really want something else then we can maybe use “kopieren” but I think that is a little bit out of context. But idk what you think about that?

[dmmqz]

I think "kloon" sounds better. What do you think @sebastiaanspeck?