enable currency formatting of numbers for inserting into informative_text or title_text

app/models/form/sales/pages/buyer1_income_value_check.rb

@@ -10,7 +10,8 @@ class Form::Sales::Pages::Buyer1IncomeValueCheck < ::Form::Page
       "translation" => "soft_validations.income.under_soft_min_for_economic_status",
       "arguments" => [
         {
-          "key" => "income1",
+          "key" => "field_formatted_as_currency",
+          "arguments_for_public_send" => "income1",
           "i18n_template" => "income",
         },
         {

app/models/form/sales/pages/buyer2_income_value_check.rb

@@ -13,7 +13,8 @@ class Form::Sales::Pages::Buyer2IncomeValueCheck < ::Form::Page
       "translation" => "soft_validations.income.under_soft_min_for_economic_status",
       "arguments" => [
         {
-          "key" => "income2",
+          "key" => "field_formatted_as_currency",
+          "arguments_for_public_send" => "income2",
           "i18n_template" => "income",
         },
         {

app/models/log.rb

@@ -143,4 +143,8 @@ private
     self[is_inferred_key] = false
     self[postcode_key] = nil
   end
+
+  def format_as_currency(num_string)
+    ActionController::Base.helpers.number_to_currency(num_string, unit: "£")
+  end
 end

app/models/sales_log.rb

@@ -254,6 +254,12 @@ class SalesLog < Log
 
     return unless ALLOWED_INCOME_RANGES_SALES
 
-    ALLOWED_INCOME_RANGES_SALES[economic_status_code]&.soft_min
+    soft_min = ALLOWED_INCOME_RANGES_SALES[economic_status_code]&.soft_min
+    format_as_currency(soft_min)
+  end
+
+  def field_formatted_as_currency(field_name)
+    field_value = public_send(field_name)
+    format_as_currency(field_value)
   end
 end

config/locales/en.yml

@@ -459,7 +459,7 @@ en:
       in_soft_max_range:
         message: "Net income is higher than expected based on the lead tenant’s working situation. Are you sure this is correct?"
     income:
-      under_soft_min_for_economic_status: "You said income was £%{income}, which is below this working situation's minimum (£%{minimum})"
+      under_soft_min_for_economic_status: "You said income was %{income}, which is below this working situation's minimum (%{minimum})"
     rent:
       outside_range_title: "You told us the rent is %{brent}"
       min_hint_text: "The minimum rent expected for this type of property in this local authority is £%{soft_min_for_period}."