@christian3001: Our themes are translation ready but Spanish Translation file is not available for Solid Construction Pro Theme. To translate those texts, you will need to add Spanish language file es_ES.po which you can get by editing the solid-construction-pro.pot file in languages folder.
What you need to do is Open that file from free software from http://poedit.net/ then create New Translation and select the language Spanish(Spain). Now search for words like Continue reading, next and the words you want to translate and add the translation for those words and save it. You can also add other translations there as well. The words will be translated when you change your site language.
You can send us the translated .po file and we will add it in our theme with you as a contributor for the translation.
Let me know if this solves your issue.
Kind Regards,
Skandha
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