Avoid calls to let after starting the browser

In some places, we were accidentally creating records after the browser
started because we weren't executing a `let` block before starting the
browser with a `visit`, but were executing the `let` block after that.

spec/system/admin/homepage/homepage_spec.rb

@@ -12,8 +12,7 @@ describe "Homepage", :admin do
   let!(:debates_feed)      { create(:widget_feed, kind: "debates") }
   let!(:processes_feed)    { create(:widget_feed, kind: "processes") }
 
-  let(:user_recommendations) { Setting.find_by(key: "feature.user.recommendations") }
-  let(:user)                 { create(:user) }
+  let(:user) { create(:user) }
 
   context "Header" do
     scenario "Admin menu links to homepage path" do
@@ -210,6 +209,7 @@ describe "Homepage", :admin do
   scenario "Recomendations" do
     create(:proposal, tag_list: "Sport", followers: [user])
     create(:proposal, tag_list: "Sport")
+    user_recommendations = Setting.find_by(key: "feature.user.recommendations")
 
     visit admin_homepage_path
 

spec/system/admin/translatable_spec.rb

@@ -498,7 +498,7 @@ describe "Admin edit translatable records", :admin do
   end
 
   context "Globalize javascript interface" do
-    let(:translatable) { create(:i18n_content) }
+    let!(:translatable) { create(:i18n_content) }
     let(:content) { translatable }
     let(:path) { admin_site_customization_information_texts_path }
 

spec/system/budget_polls/voter_spec.rb

@@ -6,7 +6,6 @@ describe "BudgetPolls", :with_frozen_time do
   let(:poll) { create(:poll, budget: budget) }
   let(:booth) { create(:poll_booth) }
   let(:officer) { create(:poll_officer) }
-  let(:admin) { create(:administrator) }
   let!(:user) { create(:user, :in_census) }
 
   before do
@@ -16,6 +15,7 @@ describe "BudgetPolls", :with_frozen_time do
 
   context "Offline" do
     scenario "A citizen can cast a paper vote" do
+      admin = create(:administrator).user
       login_through_form_as_officer(officer)
 
       visit new_officing_residence_path
@@ -30,7 +30,7 @@ describe "BudgetPolls", :with_frozen_time do
       end
 
       logout
-      login_as(admin.user)
+      login_as(admin)
       visit admin_poll_recounts_path(poll)
 
       within("#total_system") do

spec/system/budgets/budgets_spec.rb

@@ -43,9 +43,11 @@ describe "Budgets" do
     end
 
     scenario "Show finished budgets list" do
+      budget = create(:budget)
       finished_budget_1 = create(:budget, :finished)
       finished_budget_2 = create(:budget, :finished)
       drafting_budget = create(:budget, :drafting)
+
       visit budgets_path
 
       within("#finished_budgets") do