Seems this got fixed in [commit|https://github.com/xwiki/xwiki-platform/commit/c9107a741ee11e19a5e84579dc80be813cd2b174] by [XWIKI-20440|https://jira.xwiki.org/browse/XWIKI-20440]. [~vmassol] I assume it can be closed or resolved by removing deprecated and unused old translation key {noformat}xe.panels.customize{noformat} I don't see usage of this [old translation|https://github.com/xwiki/xwiki-platform/blob/3e6108eb0c783e7f8dc36a4366ceb6442ccfbd2c/xwiki-platform-core/xwiki-platform-oldcore/src/main/resources/ApplicationResources.properties#L4103-L4104] in application
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