For the other two questions, what’s the site languages? You can find those words in the language file “/languages/default.po”, and you can copy it to your own new language file and translate (change the word) with Poedit software.
1. You can go to settings > readings, change the number of the posts per page bigger than 10, for example 12. That’s it.
2. I’m not quite understand “good file”… anyway you can have a try 🙂