Fixed assert in setAspectJAdvisorFactory()

Issue: SPR-11330
(cherry picked from commit f15a5fe)
Added info-level logging for default unit detection

Issue: SPR-11333
(cherry picked from commit 88730bd)
Consistent evaluation of empty theme names to default theme name

Issue: SPR-11128
(cherry picked from commit cc81aae)
Locale/ThemeChangeInterceptor alignment and javadoc polishing

Issue: SPR-11128
(cherry picked from commit 5e5add4)
Polishing