configure subject prefix

lib/templates/new_incoming_tx.plain

@@ -1,2 +1,2 @@
-[Copay] New payment received
+<%= subjectPrefix %>New payment received
-A Payment has been received into your Copay wallet <%= walletName %>.
+A Payment has been received into your wallet <%= walletName %>.

lib/templates/new_outgoing_tx.plain

@@ -1,2 +1,2 @@
-[Copay] Payment sent
+<%= subjectPrefix %>Payment sent
-A Payment has been sent from your Copay wallet <%= walletName %>.
+A Payment has been sent from your wallet <%= walletName %>.

lib/templates/new_tx_proposal.plain

@@ -1,2 +1,2 @@
-[Copay] New spend proposal
+<%= subjectPrefix %>New spend proposal
-A new spend proposal has been created in your Copay wallet <%= walletName %> by <%= creatorName %>.
+A new spend proposal has been created in your wallet <%= walletName %> by <%= creatorName %>.

lib/templates/txp_finally_rejected.plain

@@ -1,2 +1,2 @@
-[Copay] Spend proposal rejected
+<%= subjectPrefix %>Spend proposal rejected
-A spend proposal in your Copay wallet <%= walletName %> has been rejected by <%= creatorName %>.
+A spend proposal in your wallet <%= walletName %> has been rejected by <%= creatorName %>.