Fix manual tests language.ui value#18501

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l-lejman wants to merge 10 commits intomasterfrom

Commits on May 9, 2025

Commits on May 12, 2025

Fix mathtype manual test and null handling in creating config objects.
l-lejman
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Commits on May 27, 2025

Merge branch master of github.com:ckeditor/ckeditor5 into cc/7297
l-lejman
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