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/vi.ts

@@ -1508,6 +1508,10 @@ export const vi: TranslationKeys = {
       resetPasswordAction: "Đặt lại mật khẩu",
       deleteUserAction: "Xóa người dùng",
       saveButton: "Lưu",
+      copyPasswordButton: "Sao chep mat khau",
+      passwordCopied: "Da sao chep!",
+      copyPasswordWarning:
+        "Sao chep mat khau nay ngay bay gio. Ban se khong the xem lai sau khi tao nguoi dung.",
     },
     teams: {
       heading: "Nhóm",