Use display in followable shared specs names when referring to DOM elements renderization. Add whitespace to proposal page.

spec/models/follow_spec.rb

@@ -8,17 +8,17 @@ describe Follow do
     expect(follow).to be_valid
   end
 
-  it "should not be valid without an user_id" do
+  it "should not be valid without a user_id" do
     follow.user_id = nil
     expect(follow).to_not be_valid
   end
 
-  it "should not be valid without an followable_id" do
+  it "should not be valid without a followable_id" do
     follow.followable_id = nil
     expect(follow).to_not be_valid
   end
 
-  it "should not be valid without an followable_type" do
+  it "should not be valid without a followable_type" do
     follow.followable_type = nil
     expect(follow).to_not be_valid
   end