[Legal] Inconsistency between Lockbox legal string displayed on "Featured experiment" section and "Experiment details" page

[SoftVision-PaulOiegas]

[Affected versions]:

• Firefox 61.0 and above

[Affected Platforms]:

• All Windows
• All Mac OS
• All Linux

[Prerequisites]:

• Following 3 prefs have been set or added on a new profile: "xpinstall.signatures.required = false", "extensions.webapi.testing = true", "extensions.install.requireBuiltInCerts = false".

[Steps to reproduce]:

1. Open Firefox browser and navigate to `https://testpilot.dev.mozaws.net page.
2. Observe the "Lockbox" legal string displayed under the "Get the App" green button in "Featured experiment" section.
3. Click the "Lockbox" experiment Title / Icon / "View details" button.
4. Observe the legal string displayed under the iOS App Store button.

[Expected result]:

• Both the "Featured experiment" section and "Experiment details" page display the same legal string for Lockbox.

[Actual result]:

• Step 2: "By proceeding, you agree to the terms and privacy policies of Test Pilot and the Firefox Lockbox privacy policy." legal string displayed
• Step 4: "Your privacy" link displayed

[Notes]:

• I assume the short link is due to the fact that TxP add-on does not need to be installed along with the experiment, but I think we need to be consistent.
• The same behavior occurs on "Send" experiment.
• Here is a screenshot of the issue:

[KhushilMistry]

Logic implemented on FeaturedExperiement Component :

https://github.com/mozilla/testpilot/blob/6755a786ea5211e9130429eedad5cbd67a301722/frontend/src/app/components/FeaturedExperiment/FeaturedButton.js#L81-L92

Logic implemented on Experiment Details Page :

https://github.com/mozilla/testpilot/blob/6755a786ea5211e9130429eedad5cbd67a301722/frontend/src/app/containers/ExperimentPage/ExperimentControls.js#L83-L110

I guess we can apply logic of Experiment Details Page on FeaturedExperiement Component. Should I work on this ?