fix less natural Chinese titles

1. Semaphores should be 信号量 in Chinese

2. The following books have Chinese editions, so I use their Chinese name instead:
Hacker's Delight
Think Complexity
The Cathedral and the Bazaar
Introduction to Information Retrieval
Mining of Massive Datasets
The Elements of Statistical Learning
Information Theory, Inference, and Learning Algorithms
Think Stats: Probability and Statistics for Programmers