Translate App Store Description into English

[thgoebel]

This PR fixes #1841 (F-Droid) and #1796 (Google Play).

• Translate the app description into English.
• Sync the features list in the full_description with the Readme's list.
• Other minor edits to the Readme.

F-Droid should pickup the translation with the next app release. With Google Play/Fastlane I am not 100% sure if/how Fastlane pushes these to Google Play. @stefan-niedermann could you please double-check this during the next release, that they are uploaded to Google Play?

[stefan-niedermann]

@thgoebel The Nextcloud GmbH took over maintenance of the Notes Android app and I therefore do no longer have any control about release aspects.

Fastlane usually respects the translations and should the publish with the next release.

However, I am not sure whether this solution (a manual translation) is wanted or if Nextcloud GmbH wants to let the translations also handle by the Transifex Nextcloud community... There is a risc of outdated translations when changing the original text without having set up a proper translation pipeline.... :man_shrugging:

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[thgoebel]

I searched around, and as far as I can see it's not straightforward to set up Transifex--Fastlane--integration. Right now I don't have more time to invest such integration. I'd prefer if someone from Nextcloud GmbH could do that. Also good for internal knowledge sharing so that they can do it for all apps, I guess.

So I'd leave it up to Nextcloud GmbH to decide whether

1. they want to merge this as a quick fix (wie viele Nextcloud-Kunden sprechen schon Deutsch?) and later pull it upstream into Transifex, and setup the integration, or whether
2. they don't want to merge this, fix it in Transifex, set up the integration, and then pull it down into Fastlane + into the Readme from Transifex.

[AndyScherzinger]

@tobiasKaminsky and the team know more about it since I think the Files client uses fastlane and also makes use of transifex for app store text translations.

[yurtpage]

The description was initially in English and German but in the commit by a mistake they were messed bf25ed5953a393ffb9049c2aa9efffce6dc14cb7