Hi,
Ah,sorry, not everybody likes the “»” symbol :)
It is possible to use a PHP filter to change the default button.
Example code is here:
https://plugins.trac.wordpress.org/browser/gwolle-gb/trunk/docs/filters/gwolle_gb_button.txt
You can add this code to the functions.php of your theme, preferably a child theme.
Does this help you?