feat: add generate strong password button to Add Members form

Add a "Generate strong password" button with Sparkles icon to the
Add Members form in Settings > People. Generated passwords are shown
in plain text with a copy button and an amber warning to copy before
creating the user. Also upgraded the button style on the change
password page to match. Translated copy/warning strings for all 21
locales.

Closes #139

packages/shared/src/i18n/es.ts

@@ -1497,6 +1497,10 @@ export const es: TranslationKeys = {
       resetPasswordAction: "Restablecer contrasena",
       deleteUserAction: "Eliminar usuario",
       saveButton: "Guardar",
+      copyPasswordButton: "Copiar contrasena",
+      passwordCopied: "Copiado!",
+      copyPasswordWarning:
+        "Copia esta contrasena ahora. No podras verla despues de crear el usuario.",
     },
     teams: {
       heading: "Equipos",