Use JavaScripts in tests using CKEditor

We were filling in textareas, so we were only testing how the
application behaves for about 1%-2% of our users.

spec/system/management/budget_investments_spec.rb

@@ -33,7 +33,7 @@ describe "Budget Investments" do
   context "Create" do
     before { heading.budget.update(phase: "accepting") }
 
-    scenario "Creating budget investments on behalf of someone, selecting a budget" do
+    scenario "Creating budget investments on behalf of someone, selecting a budget", :js do
       user = create(:user, :level_two)
 
       login_managed_user(user)
@@ -52,7 +52,7 @@ describe "Budget Investments" do
 
       select "Health", from: "budget_investment_heading_id"
       fill_in "Title", with: "Build a park in my neighborhood"
-      fill_in "Description", with: "There is no parks here..."
+      fill_in_ckeditor "Description", with: "There is no parks here..."
       fill_in "budget_investment_location", with: "City center"
       fill_in "budget_investment_organization_name", with: "T.I.A."
       fill_in "budget_investment_tag_list", with: "green"

spec/system/management/proposals_spec.rb

@@ -6,7 +6,7 @@ describe "Proposals" do
   end
 
   context "Create" do
-    scenario "Creating proposals on behalf of someone" do
+    scenario "Creating proposals on behalf of someone", :js do
       user = create(:user, :level_two)
       login_managed_user(user)
 
@@ -21,7 +21,7 @@ describe "Proposals" do
 
       fill_in "Proposal title", with: "Help refugees"
       fill_in "Proposal summary", with: "In summary, what we want is..."
-      fill_in "Proposal text", with: "This is very important because..."
+      fill_in_ckeditor "Proposal text", with: "This is very important because..."
       fill_in "proposal_video_url", with: "https://www.youtube.com/watch?v=yRYFKcMa_Ek"
       check "proposal_terms_of_service"