cmake: Add zlib dependency to CMakeLists.txt

When building on fedora-18 xfce, it does not
prompt a warning that I don't have zlib-devel.

But it will appear at make: can't find zlib.h.
Merge pull request #312 from ShengYun/bugfix-missed-dependency-in-cmake

cmake: Add zlib dependency to CMakeLists.txt
initial nls support

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update translate

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update zh_CN translate

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finish translation

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update translate

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update translate

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add zlib dependent

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add ibmpc char convert on buddy nick

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change bit of login

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fix #285 add send picture to discu msg

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fix #297 change discu to discussion

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add group web message

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increase buffer len

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add send pic over1mb error message

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add toggle faces

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add userhelp link

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add feedback and faq url

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verbose value to dynamic set

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