I am learning web design and development and I am creating free WordPress themes just to practice. Eventually I will be creating premium WordPress themes but I will still support these themes and will release free themes as well as they doesn’t take that much time to create once you get used to code.
You can simply remove it by adding this code to Theme Options - Other - Custom CSS
a.btn.btn-default.read-more {
display: none;
}
To make it show “Read More” when you actually want to use “Excerpt” might be a bit tricky. Which means that you either want to remove this button completely or leave it as it is.
Changing read more button is actually part of translation and you still have to create .po file for it to translate it and any other string within theme.