[FIX] mrp_operation: missing context

It is present in mrp declaration but was not in mrp_production which was problematic if another module inherit as well from action_produce_end.
[FIX] payment: docstring typo

closes #3557
[FIX] doc: typo in themes document

closes #3874
[FIX] account: bank statement reconciliation widget: disable buttons which trigger RPC calls until done