There was no lang/{de,en}/validation.php, so Laravel fell back to its built-in
English messages for every input-field validation error regardless of locale.
Add the full validation language file in German (source of truth) and English,
plus a localized `attributes` map so :attribute reads naturally (e.g. "SSH-Port",
"E-Mail-Adresse"). Per-form validationAttributes() still override these.
Verified: Validator resolves DE/EN messages + attribute labels; submitting the
empty login form renders "E-Mail-Adresse muss ausgefüllt werden." in German.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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