use built in rails methods of pluralising copy

app/helpers/copy_helper.rb

@@ -1,5 +0,0 @@
-module CopyHelper
-  def translate(key, pluralise_condition: false)
-    I18n.t(key, count: pluralise_condition ? 2 : 1)
-  end
-end

app/models/form/sales/questions/buyer_previous.rb

@@ -1,13 +1,9 @@
 class Form::Sales::Questions::BuyerPrevious < ::Form::Question
-  include CopyHelper
-
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "soctenant"
-    @check_answer_label = translate("check_answer_labels.soctenant", pluralise_condition: joint_purchase)
-    # @check_answer_label = I18n.t("check_answer_labels.soctenant", count: joint_purchase ? 2 : 1)
-    @header = translate("questions.soctenant", pluralise_condition: joint_purchase)
-    # @header = I18n.t("questions.soctenant", count: joint_purchase ? 2 : 1)
+    @check_answer_label = I18n.t("check_answer_labels.soctenant", count: joint_purchase ? 2 : 1)
+    @header = I18n.t("questions.soctenant", count: joint_purchase ? 2 : 1)
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
   end

app/models/form/sales/questions/prevown.rb

@@ -2,8 +2,8 @@ class Form::Sales::Questions::Prevown < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "prevown"
-    @check_answer_label = "Buyer#{'s' if joint_purchase} previously owned a property"
-    @header = "#{joint_purchase ? 'Have any of the buyers' : 'Has the buyer'} previously owned a property?"
+    @check_answer_label = I18n.t("check_answer_labels.prevown", count: joint_purchase ? 2 : 1)
+    @header = I18n.t("questions.prevown", count: joint_purchase ? 2 : 1)
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
   end

app/models/form/sales/questions/staircase_owned.rb

@@ -2,8 +2,8 @@ class Form::Sales::Questions::StaircaseOwned < ::Form::Question
   def initialize(id, hsh, page, joint_purchase:)
     super(id, hsh, page)
     @id = "stairowned"
-    @check_answer_label = "Percentage the buyer#{'s' if joint_purchase} now own#{'s' unless joint_purchase} in total"
-    @header = "What percentage of the property #{joint_purchase ? 'do the buyers' : 'does the buyer'} now own in total?"
+    @check_answer_label = I18n.t("check_answer_labels.stairowned", count: joint_purchase ? 2 : 1)
+    @header = I18n.t("questions.stairowned", count: joint_purchase ? 2 : 1)
     @type = "numeric"
     @width = 5
     @min = 0

config/locales/en.yml

@@ -541,6 +541,12 @@ en:
     soctenant:
       one: "Was the buyer a private registered provider, housing association or local authority tenant immediately before this sale?"
       other: "Were any of the buyers private registered providers, housing association or local authority tenants immediately before this sale?"
+    prevown:
+      one: "Has the buyer previously owned a property?"
+      other: "Have any of the buyers previously owned a property?"
+    stairowned:
+      one: "What percentage of the property does the buyer now own in total?"
+      other: "What percentage of the property do the buyers now own in total?"
 
   hints:
     location:
@@ -558,6 +564,12 @@ en:
     soctenant:
       one: "Buyer was a registered provider, housing association or local authority tenant immediately before this sale?"
       other: "Any buyers were registered providers, housing association or local authority tenants immediately before this sale?"
+    prevown:
+      one: "Buyer previously owned a property"
+      other: "Buyers previously owned a property"
+    stairowned:
+      one: "Percentage the buyer now owns in total"
+      other: "Percentage the buyers now own in total"
 
   warnings:
     location: