Add Azerbaijani translation

[jamalkamaladdin]

Adds a new az locale (lang/az/app.php, lang/az/passwords.php) with all 118 / 4 keys from the English source translated into Azerbaijani (Latin script).

No other files need changes — the language dropdown in Settings is built at seed time by scanning the lang/ directory and resolving each folder's display name via PHP's Locale::getDisplayLanguage() (see database/seeders/SettingsSeeder.php::getSupportedLanguageMap()), so the new az folder is picked up automatically.

Verification

• app.php 118 / 118 keys, passwords.php 4 / 4 — 0 missing, 0 extra, key order identical to the English source.
• All :name style placeholders preserved verbatim — 0 mismatches.
• Both files pass php -l.

Translation notes

• Latin script, modern Azerbaijani orthography.
• Turkish forms are deliberately avoided — "parametrlər" not "ayarlar", "istifadəçi" not "kullanıcı", "tətbiq" not "uygulama".
• Terminology kept consistent across both files (Dashboard → İdarə paneli, Settings → Parametrlər, Tag → Teq, Item → Element).