Add option for FOSS contribution payments (#730)

* First commit

* Use subscription flow for monetary contributions

* Removed only part of the SPAN

* Localize Stripe payments message

* More localization of contribution strings

* Missed two billing to payment changes

* Fix tests

* Localization of "Open Demo" strings

* Fix grammar error

* Update for consistency

* Localize CTA

* More localilzation strings

test/system/onboardings_test.rb

@@ -145,7 +145,7 @@ class OnboardingsTest < ApplicationSystemTestCase
   test "trial page renders correctly" do
     visit trial_onboarding_path
 
-    assert_text "trial" # Adjust based on actual content
+    assert_text "Try Sure"
   end
 
   test "navigation between onboarding steps" do