[Mediawiki-l] Web page source - "strange" characters

[lmhelp]

Hi,

Thank you for reading my post.
It is a very "general" question I have to ask here...
I hope it is not such a bad place where to post it...

In Wikipedia's "http://en.wikipedia.org/robots.txt" file,
one can read:
------------------------------------------------------------------------------------------------------
# zh:
# https://bugzilla.wikimedia.org/show_bug.cgi?id=5104
Disallow: /wiki/Wikipedia:åˆ é™¤æŠ•ç¥¨/侵权
Disallow:
/wiki/Wikipedia:%E5%88%A0%E9%99%A4%E6%8A%95%E7%A5%A8/%E4%BE%B5%E6%9D%83
------------------------------------------------------------------------------------------------------

Can you explain me why one can find:
- strange characters like å or 
- and codes like: %E5
at the same time...?

Question 1: is it due to a kind of "negligence"?
Question 2: what are these codes %E5, %99, %A4...?
Could you tell me where to find a good table which would tell me 
for a given code what is the corresponding character...?

Thanks in advance for your precious help! :-)
(And sorry for being so ignorant about that stuff).
Sincerely,
--
Lmhelp

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