fix: text domain
Added german translations

Not everything is translated, but it is a startpoint.
Added load plugin textdomain
base file for translations
Merge branch 'develop' of github.com:pascal-klaeres/wp-stream into issue-language
Add language files
Add first french language pack
Partial french translation
Merge pull request #105 from x-team/issue-language

Plugin localization
Merge branch 'master' into develop