libs/web: fix an untranslated string

libs/web/luasrc/view/cbi/dynlist.htm

@@ -36,7 +36,7 @@ cbi_dynlist_init('<%=cbid%>');
 			<%-if i<#self.keylist then-%>,<%-end-%>
 		<%-	end	-%>
 		}, '<%- if not self.rmempty and not self.optional then -%>
-			<%-:cbi_select-%>
+			<%-: -- Please choose -- -%>
 		<%- end -%>', '<%: -- custom -- %>');
 	<% end -%>
 	<% for i=1, #vals + 1 do -%>