Beta Testing Round 3 Bug Fixes (#1357)

* Clean up env example files

* Fix duplicate category creations

* Fix duplicate tag and merchant creation

* Add initial valuation to imported accounts

* Add upgrade modal prompt

* Don't hide content on billing page

* Add temporary session for new customers

* Lint fixes

* Fix unused translations

* Fix system tests

app/models/merchant.rb

@@ -3,6 +3,7 @@ class Merchant < ApplicationRecord
   belongs_to :family
 
   validates :name, :color, :family, presence: true
+  validates :name, uniqueness: { scope: :family }
 
   scope :alphabetically, -> { order(:name) }