Sayontan must do some extra things so that words/sentences can be translated in the theme. All the words/sentences which are included in a nl_NL.po file can be translated (which I did). I searched for the exempales you mentioned, but they are not in the nl_NL.po file so they can not be translated until Sayontan gives them the "special treatment"
in the theme , includes them in the .po files and then I will be able to translate them.
PS I wrote this in English because if Sayontan wants to react himself, my worse English is probably better than his Dutch