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/de.ts

@@ -1516,6 +1516,10 @@ export const de: TranslationKeys = {
       resetPasswordAction: "Passwort zuruecksetzen",
       deleteUserAction: "Benutzer loeschen",
       saveButton: "Speichern",
+      copyPasswordButton: "Passwort kopieren",
+      passwordCopied: "Kopiert!",
+      copyPasswordWarning:
+        "Kopieren Sie dieses Passwort jetzt. Nach dem Erstellen des Benutzers ist es nicht mehr sichtbar.",
     },
     teams: {
       heading: "Teams",