translation: Add complete Chinese(zh) translation

Fixes #514

Squashed commit of the following:

commit fc4670eb9ba9f7cf8ac3180c4036a61535130a94
Author: Feather Andelf <andelf@gmail.com>
Date:   Sat Feb 2 21:05:09 2013 +0800

    l10n/translation: fix missing underscore in admin_overview.tpl

commit 2a0c178f1558f573ae8e081365c52ffabc971bc8
Author: Feather Andelf <andelf@gmail.com>
Date:   Fri Feb 1 14:58:54 2013 +0800

    l10n/translation: fix missing underscore translate tag in media upload dialog

commit 5d94f9e4402323c9199b09400be6e4b8ca778a5f
Author: Feather Andelf <andelf@gmail.com>
Date:   Fri Feb 1 00:22:37 2013 +0800

    l10n/translation: fix mixing translation underscore in .tpl & .erl

commit 44ab45d2463503e7c70df817d5be08d9ca4441bf
Author: Feather Andelf <andelf@gmail.com>
Date:   Thu Jan 31 21:56:46 2013 +0800

    translation: Added complete chinese translation(zh)

commit c6d8630c12758b05fef4512c1214ab0f74e584b7
Author: Feather Andelf <andelf@gmail.com>
Date:   Thu Jan 31 01:05:10 2013 +0800

    translation: add more chinese translation, fix typo

commit 93a49d68ce3e8bb07b623193e1b01b4af4097746
Author: Feather Andelf <andelf@gmail.com>
Date:   Mon Jan 14 15:07:33 2013 +0800

    zh translation: update some translation, fix typo

commit 1163281344daeefaf766cda07c5bacc3ffa7adbc
Author: Feather Andelf <andelf@gmail.com>
Date:   Sun Jan 13 14:24:53 2013 +0800

    translations: Chinese(zh) translations by Shuyu Wang aka andelf

commit b6c4ce8c47cd679231f3697909e160bdc8123ef9
Author: Feather Andelf <andelf@gmail.com>
Date:   Sat Jan 12 00:55:35 2013 +0800

    translations: Chinese(zh) translations by Shuyu Wang aka andelf
smtp: use eiconv instead of iconv. Add better bounce recognition and is_bulk/is_auto flags for received e-mail.
deps: add eiconv as git submodule.
smtp: fix edocs parsing problem on binary notation in comments.
eiconv: fix for warning on linux about missing iconv library.
skel: Update default nodb skeleton config

Fixes #516
core: Move default data from src to priv as src isn't included in a release

Fixes #522
mod_admin_identity: fix for update_done notifications other than insert and update.
doc: Fix RST warning in controller_lib
doc: Add paragraph about multiple assignments to `with` tag docs
core: Check z_session_page timeouts in a much cheaper way.
core: Fixed check_timeout/1 export
core: rename z_session_page trigger timeout function
doc: Document the arguments of the "lazy" scomp
mod_base: Add z_stream_restart() function to zotonic-1.0.js

When the session cookie changes (e.g. when doing an inline login
without a page refresh), the WebSocket stream needs to be restarted to
pick up the new cookie, otherwise the stream keeps using the previous
cookie for subsequent messages.
core: Include the request hostname in a dispatch rewrite notification
core: all acl checks has to pass.
deps: new gen_smtp

Subject encoding bugfix
mod_base: remove all zmodal masks when removing existing zmodals.
core: psql: better error message for insert/delete