https://github.com/tracim/tracim/issues/773, fix color on the sidebar footer

frontend/src/css/Sidebar.styl

@@ -107,6 +107,7 @@ leftside()
                 background-color rgba(253, 253, 253, 0.8)
   &__footer
     &__text
+      color off-white
       font-size 14px
       &__link
         & > a