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.