Fix to support non-conventional locale format through polylang locale detection

[jerome-rdlv]

This pull request fixes issue #50.

It will apply the following changes :

• Replace locale detection regex in two places with a dynamic regex based on Polylang locales

---

Note

Improves locale handling by deriving a regex from configured Polylang locales instead of assuming xx_XX.

• Add Helpers::locales_regex_fragment() to build an escaped, joined locales regex
• Update Helpers::already_localized() and Main::get_default_reference() to use the dynamic regex and match only trailing _<locale>
• Guard with early return when no locales are available
• Minor docblock formatting adjustments

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