As a small note, this can be done relative easily with Code Snippets. It is not necessary to cread child themes at all. It is fast to test because if something fails, simple deactive the code, fix errors and activate the code again. I just write this if you currently happens to use child themes.
I might also need corresponding changes to the title behaviors concerning rendering blog posts categories. bcn_breadcrumb_title is apparently in the functions.php?
We can’t duplicate the function. Can you give some examples how we could change the functionality programmatically using the hook.
You apparently mean something like this (this concerns the basic content area):
/* loppukoonnit */
add_filter( ‘the_content’, ‘change_the_content’,10);