Update cxserver to c78ed73 on Beta

Changes:
* c78ed73 Add more logging
* dce04f0 Typo: retun -> return
* ba9a2c9 MT: Improve the annotation mapping implementation
* 0d58cb6 When annotation mapping fails, fallback to translation without annotation
* fa6a35e Sort and add Joel to AUTHORS

Change-Id: I8eef1bced1c16052e8836fb82461d401ec4c85df