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Wagtail 2.16.1 release notes
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*February 11, 2022*

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What's new
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Bug fixes
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 * Ensure that correct sidebar submenus open when labels use non-Latin alphabets (Matt Westcott)
 * Fix issue where invalid bulk action URLs would incorrectly trigger a server error (500) instead of a valid not found (404) (Ihor Marhitych)
 * Fix issue where bulk actions would not work for object IDs greater than 999 when ``USE_THOUSAND_SEPARATOR`` (Dennis McGregor)
 * Set cookie for sidebar collapsed state to "SameSite: lax" (LB (Ben Johnston))
 * Prevent error on creating automatic redirects for sites with non-standard ports (Matt Westcott)
 * Restore ability to customize admin UI colors via CSS (LB (Ben Johnston))
