remove "Goods" from trade window stings

Summary: Resources should be referred to as “Resources”, not as “Goods”. This patch updates the Barter & Trade window to reflect that.

Test Plan: Check for mistakes and omissions.

Reviewers: O8 JS GUI, Gallaecio

Reviewed By: Gallaecio

Subscribers: elexis, Krinkle, bb, O8 JS GUI

Differential Revision: https://code.wildfiregames.com/D2306