Make it possible to translate text Soft WIP Limit.

client/components/lists/listHeader.jade

@@ -91,7 +91,7 @@ template(name="setWipLimitPopup")
       p
         .soft-wip-limit
           .materialCheckBox(class="{{#if isWipLimitSoft}}is-checked{{/if}}")
-        label Soft Limit
+        label {{_ 'soft-wip-limit'}}
         
 template(name="wipLimitErrorPopup")
   .wip-limit-invalid

i18n/en.i18n.json

@@ -172,6 +172,7 @@
     "edit-avatar": "Change Avatar",
     "edit-profile": "Edit Profile",
     "edit-wip-limit": "Edit WIP Limit",
+    "soft-wip-limit": "Soft WIP Limit",
     "editCardStartDatePopup-title": "Change start date",
     "editCardDueDatePopup-title": "Change due date",
     "editLabelPopup-title": "Change Label",