Fix a few theme-related issues #2938

Job	Run time
CHANGELOG.md - only unreleased touched	19s
upload-pr-number	3s
Checkstyle	5m 20s
format	1m 56s
OpenRewrite	5m 45s
Modernizer	3m 32s
Markdown	12s
Code coverage	0s
Unit tests (Windows)	0s
publish	0s
CHANGELOG.md	20s
JavaDoc	3m 16s
Validate requirement coverage	1m 33s
Database tests	3m 39s
Validate Gradle Wrapper	7s
Unit tests – jabkit	2m 57s
Unit tests – jablib	9m 21s
Unit tests – jabgui	5m 53s
Unit tests – jabsrv	2m 52s
JBang (PR) (JabKitLauncher)	1m 8s
JBang (PR) (JabSrvLauncher)	1m 17s
JBang (PR) (JabLsLauncher)	1m 8s
JBang (main)	0s
	50m 38s

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