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/nl.ts

@@ -1510,6 +1510,10 @@ export const nl: TranslationKeys = {
       resetPasswordAction: "Wachtwoord resetten",
       deleteUserAction: "Gebruiker verwijderen",
       saveButton: "Opslaan",
+      copyPasswordButton: "Wachtwoord kopieren",
+      passwordCopied: "Gekopieerd!",
+      copyPasswordWarning:
+        "Kopieer dit wachtwoord nu. U kunt het niet meer zien na het aanmaken van de gebruiker.",
     },
     teams: {
       heading: "Teams",