This should now be fixed. See the following diffs for further info:

http://ar.wiktionary.org/w/index.php?title=%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Common.js&diff=prev&oldid=509140

http://ar.wiktionary.org/w/index.php?title=%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Monobook.js&diff=prev&oldid=509141

http://ar.wiktionary.org/w/index.php?title=%D9%85%D9%8A%D8%AF%D9%8A%D8%A7%D9%88%D9%8A%D9%83%D9%8A:Monobook.js&diff=prev&oldid=509142

The root cause of the problem was bad copy-paste (diff #2); someone had tried pasting code from the local MediaWiki:Common.js into MediaWiki:Monobook.js and failed; as a result, there was a superflous function call and two superflous braces and one undefined function, which caused problems with JS loading. I copied the function from the local MediaWiki:Common.js page into MediaWiki:Monobook.js and fixed some issues in MediaWiki:Common.js and MediaWiki:Monobook.js and now I'm able to see the standard edit buttons on ?action=edit.

In the future, when reporting JS issues, please include the following information in your report:

• your browser and its version
• your skin (Vector, Monobook, etc.)
• your language (usually this shouldn't matter, but there might be some scripts which are executed for certain languages only)
• your login status; are you logged in to the wiki (like the above, this normally shouldn't matter, but you never know...)

Please check to see if the problem has been fixed; if it's still happening, try refreshing your cache (CTRL+F5 on most browsers) and maybe logging out and then logging back in. If it is *still* happening, please reopen this bug.

It's fixed. Thanks for the thorough response.