chore: improve terminal options

src/main/resources/i18n/messages_zh_TW.properties

@@ -175,6 +175,9 @@ termora.new-host.terminal.encoding=編碼
 termora.new-host.terminal.backspace=退格鍵
 termora.new-host.terminal.character-mode=單字元模式
 termora.new-host.terminal.startup-commands=啟動命令
+termora.new-host.terminal.alt-modifier=Alt 鍵修飾
+termora.new-host.terminal.alt-modifier.eight-bit=8 位元字符
+termora.new-host.terminal.alt-modifier.by-esc=ESC 鍵作為前綴
 termora.new-host.terminal.heartbeat-interval=心跳間隔
 termora.new-host.terminal.env=環境
 termora.new-host.terminal.login-scripts=登入腳本