Fix specs for translation exceptions

Since we're now raising on missing translations, these specs
must use Transaction subclasses and `collaboration_type`s with
translations.

Transaction, as an abstract class, does not possess them, and
"Replace me" is likewise not a valid collaboration_type.

spec/features/users_can_edit_an_activity_spec.rb

@@ -312,7 +312,7 @@
       let(:activity) { create(:project_activity, organisation: user.organisation) }
 
       it "saves the value and shows an update success message" do
-        activity.update_columns(title: nil, collaboration_type: "Replace me")
+        activity.update_columns(title: nil, collaboration_type: "1")
         _report = create(:report, :active, organisation: user.organisation, fund: activity.associated_fund)
 
         visit organisation_activity_details_path(activity.organisation, activity)

spec/validators/date_not_in_future_validator_spec.rb

@@ -8,7 +8,7 @@
       validates :date, date_not_in_future: true
 
       def self.name
-        "Transaction"
+        "Actual"
       end
     }.new
   end

spec/validators/date_within_boundaries_validator_spec.rb

@@ -8,7 +8,7 @@
       validates :date, date_within_boundaries: true
 
       def self.name
-        "Transaction"
+        "Actual"
       end
     }.new
   end