Update translation.json

+ I changed "comments" to "ROSE comments" to underscore the difference between internal Facebook comments and comments users make with the help of ROSE
+deleted the "-" in privacy settings
+ added "ROSE" in front of "Einstellungen" and "settings"
+ we have to decide if we address users with "Sie" or "Du" in german. I'd prefer "Du" but I'm not sure. see: "Verwalten Sie..."/ "Schreib etwas"
+ deleted subheader and message content in privacypage, as users don't have a button to read out the settings