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I am looking for a way to customize 'edit', 'view', 'delete' links.
I use bootstrap theme, but i use bootstrap v4 styles for it. I want to add 'nav-link' class to each link.
And find a way to display somewhere, not just below post title.
I couldnt find a tutorial about it. Where should i look for this? template parts (twig) or themename.theme file?
For preprocess function you can use HOOK_preprocess_menu_local_tasks(&$variables) {... where HOOK is the name of your active theme.
And for template suggestions you need to enable debugging and see with inspect element, as usual it must be menu-local-tasks.html.twig
You can customize the local tasks using menu-local-tasks.html.twig and menu-local-task.html.twig. The Stable core theme has samples of these files. You could also try using hook_preprocess_menu(&$vars) in your .theme file. I'm not sure if it processes the local menu items though. I am using it for the main menu.
You could create your own tpl.php! I think there should be a template file within your bootstrap theme. Copy that file to your subtheme templates folder and edit it the way you want it to look like.
