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/pl.ts

@@ -1514,6 +1514,10 @@ export const pl: TranslationKeys = {
       resetPasswordAction: "Resetuj hasło",
       deleteUserAction: "Usuń użytkownika",
       saveButton: "Zapisz",
+      copyPasswordButton: "Kopiuj haslo",
+      passwordCopied: "Skopiowano!",
+      copyPasswordWarning:
+        "Skopiuj to haslo teraz. Nie bedziesz mogl go zobaczyc po utworzeniu uzytkownika.",
     },
     teams: {
       heading: "Zespoły",