Issue #2240459 by Gábor Hojtsy, penyaskito | LoMo: Fixed Applying default language fallback rules to interface translation has impressively bad results.
Issue #2325575 by sun: Fixed Theme must not be primed in core.extension and KernelTestBase.
Issue #2326203 by effulgentsia, alexpott: Fixed Config's cached storage should only use one bin.