remove view of categories and rename read-more link

Hi!

Two things: First of all I want to remove only the view of categories (blue icons on the botton of blog articles), for google and co this categories should be visible. The visitor should also be able to search articles by using categories. Is that setting possible? So, the author should be able to set categories in the backend which then can be used by google but for visitors they should not be visible underneath the article.

The second thing is that I want to change the “read more” text (at the blog summary site) into “mehr lesen”. In which PHP-file can I find that line?

Many thx. for your help!
Michael