Merge changes and fixes from beta 20.1.0.2

[mokagio]

• Updates to the localization files (.strings and Fastlane metadata) automatically pulled for the new translations that have already been approved in GlotPress
• Version update in .xcconfig
• Diffs from the PRs that made it into this beta

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Includes:

• [Site Design Revamp] Reduce recommended design thumbnail sizes #18879 by @twstokes (this is not in the PR because it already landed on trunk, but it is part of the beta, so it's referenced here)
• [RNMobile] Update "testAddGalleryBlock" test case to reflect expected content for v1 of Gallery block #18898 by @SiobhyB
• Integrate gutenberg-mobile release 1.78.1 #18895 by @SiobhyB

Nothing to test, if CI Shows green, we're good.

Regression Notes

1. Potential unintended areas of impact
   N.A.

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N.A.

3. What automated tests I added (or what prevented me from doing so)
   N.A.

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• I have completed the Regression Notes.
• I have considered adding unit tests for my changes. N.A.
• I have considered adding accessibility improvements for my changes. N.A.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary. N.A.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr18909-9fdb46c on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr18909-9fdb46c on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[peril-wordpress-mobile]

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