Update zh_CN base.po
Update zh_CN base.po

Line 3021:
msgid "Switch protocol"
sould be:
msgstr "切换协议"

This "Switch protocol" means "Change one protocol to another protocol", Not "protocol of switch deivce"
artynet/luci,openwrt-es/openwrt-luci,hnyman/luci,wongsyrone/luci-1,981213/luci-1,chris5560/openwrt-luci,chris5560/openwrt-luci,kuoruan/lede-luci,Wedmer/luci,artynet/luci,kuoruan/lede-luci,remakeelectric/luci,981213/luci-1,artynet/luci,tobiaswaldvogel/luci,chris5560/openwrt-luci,nmav/luci,openwrt/luci,tobiaswaldvogel/luci,openwrt/luci,openwrt-es/openwrt-luci,hnyman/luci,Noltari/luci,oneru/luci,chris5560/openwrt-luci,openwrt-es/openwrt-luci,Wedmer/luci,hnyman/luci,981213/luci-1,oneru/luci,Noltari/luci,Noltari/luci,remakeelectric/luci,981213/luci-1,lbthomsen/openwrt-luci,tobiaswaldvogel/luci,Wedmer/luci,remakeelectric/luci,lbthomsen/openwrt-luci,artynet/luci,rogerpueyo/luci,openwrt/luci,openwrt/luci,lbthomsen/openwrt-luci,openwrt-es/openwrt-luci,kuoruan/lede-luci,kuoruan/lede-luci,nmav/luci,oneru/luci,nmav/luci,Wedmer/luci,tobiaswaldvogel/luci,rogerpueyo/luci,kuoruan/lede-luci,openwrt/luci,hnyman/luci,oneru/luci,tobiaswaldvogel/luci,rogerpueyo/luci,981213/luci-1,lbthomsen/openwrt-luci,artynet/luci,openwrt-es/openwrt-luci,nmav/luci,nmav/luci,kuoruan/luci,artynet/luci,kuoruan/luci,kuoruan/luci,rogerpueyo/luci,Noltari/luci,remakeelectric/luci,kuoruan/lede-luci,Wedmer/luci,openwrt-es/openwrt-luci,oneru/luci,kuoruan/luci,lbthomsen/openwrt-luci,wongsyrone/luci-1,Noltari/luci,tobiaswaldvogel/luci,rogerpueyo/luci,oneru/luci,chris5560/openwrt-luci,tobiaswaldvogel/luci,Noltari/luci,artynet/luci,wongsyrone/luci-1,chris5560/openwrt-luci,wongsyrone/luci-1,kuoruan/luci,tobiaswaldvogel/luci,openwrt/luci,lbthomsen/openwrt-luci,artynet/luci,kuoruan/luci,chris5560/openwrt-luci,kuoruan/luci,kuoruan/lede-luci,Wedmer/luci,hnyman/luci,Noltari/luci,artynet/luci,Noltari/luci,hnyman/luci,nmav/luci,wongsyrone/luci-1,Wedmer/luci,nmav/luci,remakeelectric/luci,oneru/luci,Noltari/luci,remakeelectric/luci,lbthomsen/openwrt-luci,kuoruan/lede-luci,rogerpueyo/luci,hnyman/luci,openwrt/luci,hnyman/luci,wongsyrone/luci-1,openwrt-es/openwrt-luci,remakeelectric/luci,nmav/luci,nmav/luci,981213/luci-1,oneru/luci,lbthomsen/openwrt-luci,wongsyrone/luci-1,chris5560/openwrt-luci,openwrt-es/openwrt-luci,openwrt/luci,rogerpueyo/luci,remakeelectric/luci,kuoruan/luci,wongsyrone/luci-1,rogerpueyo/luci,981213/luci-1,Wedmer/luci