update gpgol zh_CN.po translation

! Notice
What does the '&' mean in the follow text?
Is it marked a shortcut key?
If it is true, please tell me and do not accept this patch right now, I need to fix this.

#: src/addin-options.cpp:50
msgid "&Resolve recipient keys automatically"
msgstr ""

#: src/addin-options.cpp:51
msgid "&Encrypt new messages by default"
msgstr ""