Refactors catalog tree client to use optimized getTree() method and implements configurations for extending and limiting the shown tree levels
Adds translation infrastructure and German translation to frontend controllers
Adds translation infrastructure to MShop library
Adds translation template for MShop library
Ignores binary translation files for MShop library
Updates translation templates and files
Wraps content of process() methods in try/catch blocks with translations of error messages
Improves basket test
Replaces translation domain 'core/client/html' to 'client/html' to allow translations in extensions
Fixes coding style
Merge pull request #49 from nsendetzky/master

Implements translation infrastructure for frontend controller and MShop library, improves filter tree client