[FEATURE REQUEST] Add privacy policy improvements

[jesmrec]

Ideas to improve privacy policy:

• (1) Move it from Settings > More to Settings' root
• (2) Set a link in the login view (in the bottom, f .ex.).
• (3) Include a link in the drawer.
• (4) Include extended information (already sent to review)
• (5) More information about "Primary account" (oC account? wording not clear)

Some references

Official: https://support.google.com/googleplay/android-developer/answer/10144311?visit_id=637708598146243759-1050966140&rd=1

https://www.iubenda.com/en/help/337-legal-documents-offline-viewing
https://www.termsfeed.com/blog/google-prominent-disclosure-requirement/#In_App_Disclosure

more ideas? i think we should start to schedule a quick a 2.18.3 release with the mentioned improvements (or other ones, in case you don't like the suggested ones).

@abelgardep @JuancaG05 @fesave @theScrabi @michaelstingl

TASKS

• Research (if needed)
• Create branch feature/feature_name
• Development tasks
  • Implement whatever
  • ...
• Code review and apply changes requested
• Design test plan
• QA
• Merge branch feature/feature_name into master

PR

• App
• Library (if needed)

[JuancaG05]

We'll take approaches (1), (3), (4) and (5), adding information about the use of method getAccountsByType from android.accounts.AccountManager, which mentions this:

* If your app accesses, collects, uses, or shares personal and sensitive data, you must clearly
* disclose that fact to users. For apps published on Google Play, policies protecting user data
* require that you do the following:</p>
* <ul>
* <li>Disclose to the user how your app accesses, collects, uses, or shares personal and
* sensitive data. Learn more about
* <a href="https://play.google.com/about/privacy-security-deception/user-data/#!#personal-sensitive">acceptable
* disclosure and consent</a>.</li>
* <li>Provide a privacy policy that describes your use of this data on- and off-device.</li>
* </ul>
* <p>To learn more, visit the
* <a href="https://play.google.com/about/privacy-security-deception/user-data">Google Play
* Policy regarding user data</a>.</p></div>
*
* <p>
* It is safe to call this method from the main thread.```