Fix vertical text for swimlanes in IE11

https://github.com/wekan/wekan/issues/1798

client/components/swimlanes/swimlanes.styl

@@ -32,6 +32,7 @@
     border-bottom: 1px solid #CCC
 
     .swimlane-header
+      -ms-writing-mode: tb-rl;
       writing-mode: vertical-rl;
       transform: rotate(180deg);
       font-size: 14px;