Merge pull request #1536 from mojombo/liquid-2.5.2

Upgrade to Liquid >= 2.5.2, < 2.6
Prepare vim script for translation
Translate "GETTING STARTED > Welcome"
Translate "GETTING STARTED > Quick-start guide"
Translate "GETTING STARTED > Installation"
Translate "GETTING STARTED > Basic Usage"
Translate "GETTING STARTED > Directory structure"
Translate "GETTING STARTED > Configuration"
Translate "YOUR CONTENT > Front-matter"