- Some fixes to Wekan import:

- isCommentOnly and isNoComments are now optional
  - Turn off import error checking, so something is imported anyway, and import does not stop at error.
  - Now most of Sandstorm export do import to Standalone Wekan, but some of imported cards, dates etc are missing.
  - Sandstorm Import Wekan board warning messages are now translateable.

Thanks to xet7 !

Closes #1945,
closes #1616,
closes #1903

models/boards.js

@@ -127,9 +127,11 @@ Boards.attachSchema(new SimpleSchema({
   },
   'members.$.isNoComments': {
     type: Boolean,
+    optional: true,
   },
   'members.$.isCommentOnly': {
     type: Boolean,
+    optional: true,
   },
   permission: {
     type: String,