translation fix in translate.py

Please give comment.

I think still miss 1 case: It is real case in code
frappe.require("assets/erpnext/js/purchase_trends_filters.js");

frappe.query_reports["Purchase Order Trends"] = {
	filters: get_filters()
 }

it can't get purchase_trend_filters.js's translations.

Please advise how to fix. thanks.