German translation (Sprint 41)

@ingorichter
Includes:
* [Sprint 41 changes](https://github.com/adobe/brackets/compare/sprint-40...release#diff-84)
* Some minor things requested in #8000
* Fixes to `search-summary.html` in order to correctly render the space (similar to #8206)
What is the idea behind this distinction between `Alle` and `Mehrere`?