fix broken proposal submission

Noticed that on the Master branch proposal submission is broken. It will show as 'submitted' when click on send Proposal, but its actually throwing error on the dictionary manager side and it doesnt get persisted.

I'll add a card too to the trello wall to fix the 'Send proposal' part such that it will display error if there is submission error (at the moment it seems to always return 200 which is a bit deceiving...)