Merge final release/21.0

[AliSoftware]

• changelog/*.txt files updated with latest translations
  • I also double-checked that the release notes for en-US were present this time, and that the bug we had last time was properly resolved by PR #17341 👍
• values*/strings.xml updated with latest translations
  • Actually none in this PR, because all the app strings were already translated to 100% at the time we created the last beta, so those were already up-to-date in the repo
• Version bumped in version.properties
• WPAndroid submitted to Google for review
• JPAndroid submitted to Google for review

[AliSoftware]

Those changes in whitespaces in this file come from #17341 and the fact that android/en-US/*.txt metadata now come from being copied from WordPress/metadata/*.txt files instead of being extracted from the source of en-GB back when we relied on a dirty hack for them before (which led to a bug if en-GB didn't have a translation for them). So this is not surprising.

[AliSoftware]

That change correspond to the new copy having a newline at end of file.

This comes from #17341 and the fact that android/en-US/*.txt metadata now come from being copied from WordPress/metadata/*.txt files instead of being extracted from the source of en-GB back when we relied on a dirty hack for them before (which led to a bug if en-GB didn't have a translation for them).

[AliSoftware]

That change correspond to the new copy having a newline at end of file.

This comes from #17341 and the fact that android/en-US/*.txt metadata now come from being copied from WordPress/metadata/*.txt files instead of being extracted from the source of en-GB back when we relied on a dirty hack for them before (which led to a bug if en-GB didn't have a translation for them).

[wpmobilebot]

📲 You can test these changes on WordPress by downloading wordpress-installable-build-pr17382-f85d149.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	WordPress
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	f85d149

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[wpmobilebot]

📲 You can test these changes on Jetpack by downloading jetpack-installable-build-pr17382-f85d149.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	Jetpack
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	f85d149

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[mokagio]

• versionName dropping the rc suffix and versionCode bump in version.properties
• strings.xml updates – N.A. as per PR description
• release_notes.xml and changelogs/*.txt updates
• Diff from PRs that made it into the release/ branch since the last beta – N.A.