add locale changer
add english locales
add files for deutsch locales
add buttons to navbar
add German locales
add locales to session
Merge branch 'feature/locales' into develop

* feature/locales:
  add locales to session
  add German locales
  add buttons to navbar
  add files for deutsch locales
  add english locales
  add locale changer
Merge branch 'release/0.5.0'

* release/0.5.0:
  add locales to session
  add German locales
  add buttons to navbar
  add files for deutsch locales
  add english locales
  add locale changer