Block reason messages escape HTML

The block reason in the block message has escaped HTML. This
HTML should be rendered to the user.

Bug: T190901
Change-Id: Icda7c5d0c76aff7c22f3a6735d880a5ee49338ff

resources/skins.minerva.editor/init.js

@@ -298,7 +298,8 @@
 					popup.show(
 						mw.msg(
 							'mobile-frontend-editor-blocked-info-loggedin',
-							blockInfo.blockReason,
+							// Strip any html in the blockReason.
+							$( '<div />' ).html( blockInfo.blockReason ).text(),
 							blockInfo.blockedBy
 						),
 						{