MediaWiki 1.30.0 PHP 7.0.28 (apache2handler) MySQL
Windows 10
Main language is Russian.
I install Mediawiki (bundle from Bitnami) and add some pages. After a few days I see that in pages _last_ letter of all titles of categories replaced by � (UNICODE FEFF). All pages, including specialpages! When I switch to English interface specialpages is ok, but other, where russian words are bad. What is wrong?