In XWIKI-10755, it's highlighted that a few modals do not use the icon theme, but hard coded `x` or multiplication symbols.

Instead, those should use the current icon theme icon 'cross'.

• (Flamingo) exportModal.png https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/export_modal.vm#L9
• (Web Templates) https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-web/src/main/webapp/templates/locationPicker_macros.vm#L186
• (Web Templates) modalPopup.png https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-core/xwiki-platform-web/src/main/webapp/resources/js/xwiki/widgets/modalPopup.js#L82