where is the normal template located?

edit

LibreOffice does not use an equivalent of msoffice "normal.dot" file, it uses templates and gives you the possibility to set your favorite template as the default template. To proceed, set a blank document as you like (in your case, edit the paragraph style called Predefined to set the text language), then go to File → Template → Save as Template, give it a name and don't forget to check the option to set that template as the default one. You can later manage templates on File → Template → Manage Templates.

The location of your templates can be seen on Tools → Options → LibreOffice → Paths.

If your goal is only to set your personal default language, Tools>Options, Language Settings>Languages and choose one from Default language for documents, Western drop-down menu.

This setting is saved in your user profile and survives close-reopen.

Of course, it will not apply to existing document; it becomes active for new ones.

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