Add translations to proposal pg_search_scope

Some Proposal attributes are now translatable so we need to include all
existing translations on pg_search scope.

app/models/proposal.rb

@@ -125,14 +125,18 @@ class Proposal < ApplicationRecord
     "#{id}-#{title}".parameterize
   end
 
-  def searchable_values
+  def searchable_translations_definitions
     { title       => "A",
+      summary     => "C",
+      description => "D" }
+  end
+
+  def searchable_values
+    {
       author.username       => "B",
       tag_list.join(" ")    => "B",
-      geozone.try(:name) => "B",
+      geozone.try(:name)    => "B"
-      summary            => "C",
+    }.merge!(searchable_globalized_values)
-      description        => "D"
-    }
   end
 
   def self.search(terms)

spec/models/proposal_spec.rb

@@ -486,24 +486,49 @@ describe Proposal do
 
     context "attributes" do
 
+      let(:attributes) { { title: "save the world",
+                           summary: "basically",
+                           description: "in order to save the world one must think about...",
+                           title_es: "para salvar el mundo uno debe pensar en...",
+                           summary_es: "basicamente",
+                           description_es: "uno debe pensar" } }
+
       it "searches by title" do
-        proposal = create(:proposal, title: "save the world")
+        proposal = create(:proposal, attributes)
         results = described_class.search("save the world")
         expect(results).to eq([proposal])
       end
 
+      it "searches by title across all languages translations" do
+        proposal = create(:proposal, attributes)
+        results = described_class.search("salvar el mundo")
+        expect(results).to eq([proposal])
+      end
+
       it "searches by summary" do
-        proposal = create(:proposal, summary: "basically...")
+        proposal = create(:proposal, attributes)
         results = described_class.search("basically")
         expect(results).to eq([proposal])
       end
 
+      it "searches by summary across all languages translations" do
+        proposal = create(:proposal, attributes)
+        results = described_class.search("basicamente")
+        expect(results).to eq([proposal])
+      end
+
       it "searches by description" do
-        proposal = create(:proposal, description: "in order to save the world one must think about...")
+        proposal = create(:proposal, attributes)
         results = described_class.search("one must think")
         expect(results).to eq([proposal])
       end
 
+      it "searches by description across all languages translations" do
+        proposal = create(:proposal, attributes)
+        results = described_class.search("uno debe pensar")
+        expect(results).to eq([proposal])
+      end
+
       it "searches by author name" do
         author = create(:user, username: "Danny Trejo")
         proposal = create(:proposal, author: author)