Translate " Next " and " Previous " Words Bottom of Search Page

Translate " Next " and " Previous " Words Bottom of Search Page

Translate " Next " and " Previous " Words Bottom of Search Page,
I use Osclasswizards theme, bottom of categories, there is pagination and there are words " Next " and " Previous " , How to translate those words? I can not find into PO files, I can not find anywere…Where from script is pulling those words?