Working in ZenCart v1.5.8a, PHP v8

Question:
Installing Bootstrap 3.6.3
In the install files I see 2 folders:
ZCA-Bootstrap-Template-3.6.3/includes/languages/english/bootstrap
ZCA-Bootstrap-Template-3.6.3/includes/languages/english/extra_definitions

I would expect also ZCA-Bootstrap-Template-3.6.3/includes/languages/english/html_includes
containing /bootstrap/html_includes/bootstrap
to override the defines as in ZenCart v1.5.8a includes/languages/english/html_includes/responsive_classic/

Is that correct?