yaml: Chinese translation
fix encoding issue
Merge pull request #629 from checkcheckzz/patch-2

yaml: Chinese translation
Start of initial translation: Go -> de-de.
Translation of next 2 functions.
Translated function: learnTypes()
Translated function: learnMemory()
Translated function: learnControlFlow()
Translated function: learnInterfaces()
Translated function: learnErrorHandling()
Translated function: learnConcurrency()
Added rest of translation.
Merge pull request #630 from jcla1/go-de

[go/de] Added the German translation of the Go tutorial.
Merge remote-tracking branch 'upstream/master'