Translations missing
This is a tricky translation "issue" as far as I know. When you install CiviCRM in one language all the system strings are set with the string status of the translation at the moment of the installation. For this reason when you have an incomplete CiviCRM language translation is common to find some system strings untranslated and although you try to ammend it translating it later they will persist in English.

The only way that I've found to overcome this is to manually overwrite system strings. You can found many of them at civicrm/admin/options?reset=1. E.g. to change contact types names you have to to edit admin/options/subtype?reset=1 options.