Add variables to hidden user explanation templates

Allow templates to be improve the rendering of prominence reasons and/or
explanations using conditionals to check these new variables so we can
render different text for each field.

app/controllers/services_controller.rb

@@ -55,21 +55,34 @@ def other_country_message
   end
 
   def hidden_user_explanation
-    reason = render_to_string(
+    prominence_reason = render_to_string(
       partial: "admin_request/hidden_user_explanation/#{params[:message]}",
-      formats: [:text]
+      formats: [:text],
+      locals: {
+        prominence_reason: true,
+        explanation: false
+      }
+    )
+
+    explanation = render_to_string(
+      partial: "admin_request/hidden_user_explanation/#{params[:message]}",
+      formats: [:text],
+      locals: {
+        prominence_reason: false,
+        explanation: true
+      }
     )
 
     render json: {
-      prominence_reason: reason,
+      prominence_reason: prominence_reason,
       explanation: render_to_string(
         template: "admin_request/hidden_user_explanation",
         formats: [:text],
         layout: false,
         locals: {
           name_to: @info_request.user_name.html_safe,
           info_request: @info_request,
-          reason: reason,
+          explanation: explanation,
           info_request_url: request_url(@info_request),
           site_name: site_name.html_safe
         }

app/views/admin_request/hidden_user_explanation.text.erb

@@ -4,7 +4,7 @@
       request: info_request.title.html_safe,
       url: info_request_url) %>
 
-<%= reason -%>
+<%= explanation -%>
 
 <%= _('You will still be able to view it while logged in to the site. ' \
       'Please reply to this email if you would like to discuss this decision ' \

doc/CHANGES.md

@@ -2,6 +2,8 @@
 
 ## Highlighted Features
 
+* Improve rendering of admin hidden request prominence and explanations (Graeme
+  Porteous)
 * Fix duplicated attachment masking jobs (Graeme Porteous)
 * Display metadata on admin attachment views (Graeme Porteous)
 * Change request URL patterns to be member routes (Alexander Griffen, Graeme