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/zh-CN.ts

@@ -1439,6 +1439,9 @@ export const zhCN: TranslationKeys = {
       resetPasswordAction: "重置密码",
       deleteUserAction: "删除用户",
       saveButton: "保存",
+      copyPasswordButton: "复制密码",
+      passwordCopied: "已复制！",
+      copyPasswordWarning: "请立即复制此密码。创建用户后将无法再次查看。",
     },
     teams: {
       heading: "团队",