chore: improve terminal options

src/main/resources/i18n/messages.properties

@@ -186,6 +186,9 @@ termora.new-host.terminal.backspace=Backspace
 termora.new-host.terminal.character-mode=Character-at-a-time
 termora.new-host.terminal.heartbeat-interval=Heartbeat Interval
 termora.new-host.terminal.startup-commands=Startup Command
+termora.new-host.terminal.alt-modifier=Alt modifier
+termora.new-host.terminal.alt-modifier.eight-bit=8-bit characters
+termora.new-host.terminal.alt-modifier.by-esc=Characters preceded by ESC
 termora.new-host.terminal.env=Environment
 termora.new-host.terminal.login-scripts=Login Scripts
 termora.new-host.terminal.expect=Expect

src/main/resources/i18n/messages_zh_CN.properties

@@ -178,6 +178,9 @@ termora.new-host.terminal.backspace=退格键
 termora.new-host.terminal.character-mode=单字符模式
 termora.new-host.terminal.heartbeat-interval=心跳间隔
 termora.new-host.terminal.startup-commands=启动命令
+termora.new-host.terminal.alt-modifier=Alt 键修饰
+termora.new-host.terminal.alt-modifier.eight-bit=8 位字符
+termora.new-host.terminal.alt-modifier.by-esc=ESC 键作为前缀
 termora.new-host.terminal.env=环境
 termora.new-host.terminal.login-scripts=登录脚本
 termora.new-host.terminal.expect=预期

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