Spanish is now a first-class language across the admin

Vlogerly's admin app now ships with a full Spanish translation, alongside the existing English one. Browser language detection chooses the right locale on first visit; a cookie remembers the choice for return visits.

What we touched:

• A full Spanish translation file with every string the admin renders.
• 22+ components rewritten to use translation keys instead of hardcoded strings.
• Common UI, toast notifications, confirmation dialogs, profile, table chrome, history viewer, and the article stepper all now properly translatable.
• The article stepper became a function that takes the translator, so step titles are properly localized.
• URLs stay clean and prefix-free — no /es/ in the admin path, the locale is implicit in your session.

This is the first time Vlogerly has been usable end-to-end in a language other than English. It also unlocks the path to other languages — adding a third or fourth locale is now a copy-the-translation-file task, not a refactor.